Tommorow is my exam and i want you to write every possible mcq asked

Reading File

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python3 << 'EOF' import pdfplumber pdf_path = "/tmp/workspace/attachments/974b9b54-bdb2-4285-8caa-3811ef9f319b/Bone histology.pdf" with pdfplumber.open(pdf_path) as pdf: print(f"Total pages: {len(pdf.pages)}") full_text = "" for i, page in enumerate(pdf.pages): text = page.extract_text() if text: full_text += f"\n\n--- PAGE {i+1} ---\n{text}" print(full_text) EOF

I have the full content. Now I'll generate a comprehensive set of MCQs covering every topic in the lecture:

🦴 Bone Histology - Complete MCQ Bank

East-West University | Structure of Life I – Week 1 Every possible exam question based on your lecture slides

SECTION 1: Skeletal System Functions & Components

Q1. Which of the following is NOT a function of the skeletal system?

A) Support
B) Protection
C) Hormone synthesis
D) Blood cell production

✅ Answer: C - Bone stores calcium/phosphate, supports, protects, and produces blood cells, but does NOT synthesize hormones.

Q2. Ligaments connect:

A) Muscle to bone
B) Bone to bone
C) Bone to cartilage
D) Muscle to muscle

✅ Answer: B

Q3. Tendons connect:

A) Bone to bone
B) Cartilage to bone
C) Muscle to bone
D) Muscle to cartilage

✅ Answer: C

Q4. Which of the following is stored in the marrow cavities of bones?

A) Protein only
B) Fat
C) Vitamin D
D) Phospholipids

✅ Answer: B

Q5. Which structure protects the brain?

A) Ribs
B) Vertebrae
C) Skull
D) Sternum

✅ Answer: C

Q6. The three types of cartilage in the body are:

A) Hyaline, Fibrocartilage, Elastic
B) Hyaline, Compact, Spongy
C) Articular, Elastic, Dense
D) Fibrocartilage, Cancellous, Elastic

✅ Answer: A

SECTION 2: Hyaline Cartilage

Q7. Which cells form the matrix of cartilage?

A) Osteoblasts
B) Chondroblasts
C) Chondrocytes
D) Osteoclasts

✅ Answer: B

Q8. Chondrocytes are:

A) Cells that form new cartilage matrix
B) Mature cartilage cells surrounded by matrix, found in lacunae
C) Cells that resorb cartilage
D) Stem cells of cartilage

✅ Answer: B

Q9. Articular cartilage differs from other hyaline cartilage because it:

A) Contains more collagen
B) Has no perichondrium
C) Contains chondroblasts only
D) Is a type of fibrocartilage

✅ Answer: B

Q10. The perichondrium is:

A) A single-layered membrane inside cartilage
B) A double-layered connective tissue sheath covering cartilage (except at articulations)
C) The inner lining of bone cavities
D) The outer fibrous layer of bone

✅ Answer: B

Q11. Appositional growth of cartilage occurs:

A) Within the existing cartilage tissue
B) At the periphery - new chondrocytes and matrix added at the outer edge
C) Only in fetal life
D) Only after fracture

✅ Answer: B

Q12. Interstitial growth of cartilage refers to:

A) Growth from the outer surface
B) Growth within the tissue - chondrocytes divide and add more matrix between cells
C) Growth stimulated by osteoblasts
D) Growth at the periosteum

✅ Answer: B

SECTION 3: Bone Shapes

Q13. Which of the following is an example of a LONG bone?

A) Carpals
B) Femur
C) Ribs
D) Vertebrae

✅ Answer: B

Q14. Flat bones include all of the following EXCEPT:

A) Ribs
B) Sternum
C) Scapula
D) Carpals

✅ Answer: D - Carpals are short bones.

Q15. Which of the following is an IRREGULAR bone?

A) Femur
B) Scapula
C) Vertebra
D) Fibula

✅ Answer: C

Q16. Short bones are exemplified by:

A) Humerus and femur
B) Carpals and tarsals
C) Ribs and sternum
D) Skull and mandible

✅ Answer: B

SECTION 4: Long Bone Structure

Q17. The shaft of a long bone is called the:

A) Epiphysis
B) Diaphysis
C) Metaphysis
D) Periosteum

✅ Answer: B

Q18. The epiphysis refers to:

A) The shaft of the long bone
B) The end of the bone, composed of cancellous bone
C) The lining of the medullary cavity
D) The outer fibrous layer of bone

✅ Answer: B

Q19. The epiphyseal plate is composed of:

A) Compact bone
B) Fibrocartilage
C) Hyaline cartilage
D) Yellow marrow

✅ Answer: C

Q20. When bone stops growing in length, the epiphyseal plate becomes the:

A) Periosteum
B) Endosteum
C) Epiphyseal line
D) Medullary cavity

✅ Answer: C

Q21. In adults, the medullary cavity of limb bones is primarily filled with:

A) Red marrow
B) Yellow marrow
C) Hyaline cartilage
D) Spongy bone

✅ Answer: B

Q22. Red marrow is found in children in the:

A) Medullary cavity of limb bones
B) Epiphyseal plate
C) Periosteum
D) Endosteum

✅ Answer: A - In children, the medullary cavity contains red marrow; it gradually changes to yellow.

Q23. Sharpey's fibers:

A) Connect osteocytes to each other
B) Are periosteal fibers that penetrate into bone to strengthen attachment of tendon to bone
C) Form the canaliculi
D) Connect blood vessels in Volkmann's canals

✅ Answer: B

Q24. The inner layer of the periosteum contains:

A) Dense fibrous connective tissue only
B) Osteoblasts, osteoclasts, and osteochondral progenitor cells
C) Yellow marrow
D) Hydroxyapatite crystals

✅ Answer: B

Q25. The endosteum:

A) Covers the outer surface of bone
B) Lines all internal spaces of bone including cancellous bone spaces
C) Is found only in long bones
D) Consists only of fibrous connective tissue

✅ Answer: B

SECTION 5: Bone Histology - Matrix & Cells

Q26. The organic component of bone matrix consists primarily of:

A) Hydroxyapatite crystals
B) Calcium phosphate
C) Collagen fibers and proteoglycans
D) Calcium carbonate only

✅ Answer: C

Q27. The inorganic component of bone matrix is:

A) Collagen
B) Proteoglycans
C) Hydroxyapatite (calcium phosphate crystals - CaPO₄)
D) Glycoproteins

✅ Answer: C

Q28. If the mineral is removed from bone, it becomes:

A) Too brittle
B) Too bendable/flexible
C) Stronger
D) Unable to support weight

✅ Answer: B

Q29. If the collagen is removed from bone, it becomes:

A) Too flexible
B) Too brittle
C) More resilient
D) Softer

✅ Answer: B

Q30. The analogy used to describe bone matrix is:

A) A sponge soaked in water
B) Reinforced concrete - collagen = rebar, hydroxyapatite = cement
C) Rubber reinforced with steel
D) Clay reinforced with sand

✅ Answer: B

Q31. Osteoblasts produce bone matrix by:

A) Phagocytosis of mineral deposits
B) Releasing collagen via ER/Golgi and exocytosis, and releasing hydroxyapatite precursors from vesicles
C) Fusing with existing osteocytes
D) Secreting acid across the ruffled border

✅ Answer: B

Q32. Osteoblasts communicate with each other through:

A) Canaliculi only
B) Gap junctions
C) Tight junctions
D) Desmosomes

✅ Answer: B

Q33. Osteocytes are:

A) Bone-destroying cells derived from monocytes
B) Precursor stem cells found in periosteum
C) Mature bone cells, stellate in shape, located in lacunae
D) Cells that produce collagen for the periosteum

✅ Answer: C

Q34. Lacunae are:

A) Hair-like canals connecting bone cells
B) Spaces occupied by the osteocyte cell body
C) Canals running perpendicular to osteons
D) Channels containing blood vessels

✅ Answer: B

Q35. Canaliculi are:

A) Spaces that contain osteocyte cell bodies
B) Canals parallel to the long axis of bone
C) Canals occupied by osteocyte cell processes connecting lacunae to each other and to the central canal
D) Canals perpendicular to Haversian canals

✅ Answer: C

Q36. Nutrients are transferred between osteocytes through:

A) Direct diffusion through bone matrix
B) Interstitial fluid in lacunae/canaliculi, then gap junctions between cells
C) Blood vessels in the lacunae
D) Tight junctions

✅ Answer: B

Q37. Osteoclasts are derived from:

A) Osteoblasts that have differentiated
B) Mesenchymal stem cells in periosteum
C) Monocytes formed from stem cells in red bone marrow
D) Chondroblasts

✅ Answer: C

Q38. The ruffled border of an osteoclast is:

A) The area where collagen is secreted
B) The site where the cell membrane borders bone and active resorption occurs
C) The connection between osteoclasts and blood vessels
D) The outer membrane of the Haversian system

✅ Answer: B

Q39. Osteoclasts resorb bone by:

A) Secreting alkaline phosphatase
B) Pumping H⁺ ions to create acid and releasing digestive enzymes
C) Phagocytosing hydroxyapatite directly
D) Secreting osteoid

✅ Answer: B

Q40. Osteoclasts are characteristically:

A) Uninucleated small cells
B) Multinucleated cells, likely arising from fusion of several cells
C) Stellate-shaped cells in lacunae
D) Cuboidal cells lining the periosteum

✅ Answer: B

Q41. Osteochondral progenitor cells (stem cells) can differentiate into:

A) Osteocytes and osteoclasts
B) Chondroblasts or osteoblasts
C) Monocytes or macrophages
D) Fibroblasts only

✅ Answer: B

Q42. Osteochondral progenitor cells originate from:

A) Monocytes in red marrow
B) Mesenchyme
C) Chondrocytes
D) Periosteal osteoclasts

✅ Answer: B

SECTION 6: Types of Bone Tissue

Q43. Woven bone is characterized by:

A) Collagen fibers arranged in concentric rings
B) Collagen fibers randomly oriented
C) Organized lamellae with parallel fibers
D) No collagen content

✅ Answer: B

Q44. Woven bone is formed during all of the following EXCEPT:

A) Fetal development
B) Fracture repair
C) Normal adult bone homeostasis
D) Remodeling of cancellous bone

✅ Answer: C - Woven bone forms during fetal development, fracture repair, and remodeling - it is eventually replaced by lamellar bone.

Q45. Lamellar bone is:

A) Randomly oriented collagen fibers
B) Mature bone arranged in sheets (lamellae) with fibers oriented in one direction per layer but alternating between layers
C) Only found in spongy bone
D) The first bone formed during development

✅ Answer: B

Q46. Why are the collagen fibers in adjacent lamellae oriented in different directions?

A) To allow more blood vessel penetration
B) To provide strength (similar to plywood construction)
C) To allow easier remodeling
D) To maximize calcium storage

✅ Answer: B

Q47. Trabeculae are:

A) Concentric rings of compact bone
B) Interconnecting rods or plates of bone found in cancellous bone, oriented along stress lines
C) Channels containing blood vessels in compact bone
D) Layers of the periosteum

✅ Answer: B

Q48. Spongy (cancellous) bone trabeculae are covered by:

A) Periosteum
B) Perichondrium
C) Endosteum
D) Sharpey's fibers

✅ Answer: C

SECTION 7: Compact Bone Structure

Q49. The structural unit of compact bone is the:

A) Trabecula
B) Lamella
C) Osteon (Haversian system)
D) Lacuna

✅ Answer: C

Q50. The Haversian canal runs:

A) Perpendicular to the long axis of bone
B) Parallel to the long axis of bone
C) Diagonally through bone
D) In a random direction

✅ Answer: B

Q51. Volkmann's canals (perforating canals) run:

A) Parallel to the long axis
B) Perpendicular to the long axis, connecting to Haversian canals
C) Through trabeculae of spongy bone
D) Between individual lamellae

✅ Answer: B

Q52. Both Haversian canals and Volkmann's canals contain:

A) Yellow marrow
B) Osteocytes
C) Blood vessels
D) Hydroxyapatite crystals

✅ Answer: C

Q53. An osteon consists of:

A) Central canal, contents, concentric lamellae, and osteocytes in lacunae
B) Trabeculae and red marrow spaces
C) Periosteum and endosteum
D) Volkmann's canals and interstitial lamellae

✅ Answer: A

Q54. Interstitial lamellae are:

A) Lamellae encircling the entire bone
B) Remnants of old osteons that have been partially remodeled and replaced
C) Lamellae forming concentric rings around the central canal
D) Lamellae found only in spongy bone

✅ Answer: B

Q55. Circumferential lamellae are located:

A) Forming rings around individual Haversian canals
B) Between osteons as remnants
C) On the periphery of the entire bone, encircling the whole structure
D) Only in the medullary cavity

✅ Answer: C

Q56. Blood vessels reach osteocytes from the Haversian canal via:

A) Volkmann's canals → Haversian canal → canaliculi → lacunae
B) Periosteum → endosteum → Volkmann's canal
C) Medullary cavity → trabeculae → canaliculi
D) Sharpey's fibers → lamellae → canaliculi

✅ Answer: A (Interstitial fluid of lacunae/canaliculi + gap junctions between osteocytes)

Q57. Blood vessels penetrate from the periosteum into bone through:

A) Haversian canals
B) Perforating (Volkmann's) canals
C) Canaliculi
D) Lacunae

✅ Answer: B

Q58. Spongy bone trabeculae receive nutrients from:

A) Haversian canals within the trabeculae
B) Canaliculi connecting to a central canal
C) Marrow tissue surrounding the trabeculae
D) Periosteal blood vessels

✅ Answer: C

SECTION 8: Bone Development (Ossification)

Q59. The two types of ossification are:

A) Appositional and interstitial
B) Intramembranous and endochondral
C) Primary and secondary
D) Cortical and cancellous

✅ Answer: B

Q60. Intramembranous ossification takes place in:

A) A cartilage model
B) Embryonic connective tissue (mesenchyme) membrane
C) The epiphyseal plate
D) Pre-existing bone

✅ Answer: B

Q61. Bones formed by intramembranous ossification include:

A) Femur, tibia, humerus
B) Vertebrae and pelvic bones
C) Many skull bones, part of mandible, diaphyses of clavicles
D) Carpals and tarsals

✅ Answer: C

Q62. Fontanels are:

A) Centers of ossification in skull bones
B) Large membrane-covered spaces between developing skull bones that are not yet ossified
C) Growth plates in short bones
D) Haversian canals of fetal bone

✅ Answer: B

Q63. Endochondral ossification involves:

A) Direct differentiation of mesenchymal cells into osteoblasts without a cartilage model
B) Replacement of a hyaline cartilage model by bone
C) Formation of bone in fibrous membranes
D) Bone formation only in flat bones

✅ Answer: B

Q64. Endochondral ossification forms which bones?

A) Skull, sternum, mandible, clavicle
B) Most bones of the skeleton including vertebrae, pelvic bones, and limb bones
C) Only the diaphyses of long bones
D) Only the epiphyses

✅ Answer: B

Q65. Both ossification methods initially produce:

A) Lamellar bone
B) Woven bone that is later remodeled
C) Compact bone directly
D) Spongy bone that persists permanently

✅ Answer: B

Q66. In endochondral ossification, chondrocytes in the center of the cartilage model:

A) Continue proliferating indefinitely
B) Become hypertrophic, synthesize alkaline phosphatase, and eventually die as matrix calcifies
C) Differentiate directly into osteoblasts
D) Migrate to the periosteum

✅ Answer: B

Q67. The primary ossification center in endochondral ossification is located in the:

A) Epiphysis
B) Articular cartilage
C) Diaphysis (center of the cartilage model)
D) Perichondrium

✅ Answer: C

Q68. The secondary ossification center:

A) Begins at 8 weeks gestation
B) Forms in the epiphysis at or after the time of birth
C) Is located in the diaphysis
D) Produces only compact bone

✅ Answer: B

Q69. Osteoid is:

A) Calcified cartilage matrix
B) Bone matrix that lacks minerals (uncalcified bone matrix)
C) The organic component only of mature bone
D) Woven bone

✅ Answer: B

Q70. In endochondral ossification, the perichondrium surrounding the diaphysis transforms into the:

A) Endosteum
B) Periosteum
C) Articular cartilage
D) Epiphyseal plate

✅ Answer: B

Q71. Intramembranous ossification begins in the embryo at approximately:

A) Week 2
B) Week 8
C) Week 16
D) Week 28

✅ Answer: B - Around week 8, ossification centers form in fibrous membranes.

SECTION 9: Epiphyseal Plate & Bone Length Growth

Q72. The five zones of the epiphyseal plate from epiphysis to diaphysis are:

A) Proliferation, resting, hypertrophic, calcified, ossification
B) Resting, proliferation, hypertrophic, calcified, ossification
C) Ossification, calcified, hypertrophic, proliferation, resting
D) Calcified, resting, proliferation, ossification, hypertrophic

✅ Answer: B

Q73. In which zone of the epiphyseal plate do chondrocytes actively divide and produce new cartilage?

A) Zone of resting cartilage
B) Zone of cartilage proliferation
C) Zone of hypertrophic cartilage
D) Zone of calcification

✅ Answer: B

Q74. The epiphyseal plate closes (becomes the epiphyseal line) at approximately what age?

A) 5–10 years
B) 12–25 years (between 16 and 25 years per lecture)
C) 30–35 years
D) 40–45 years

✅ Answer: B

Q75. Bone lengthening can ONLY occur by:

A) Interstitial growth of bone
B) Appositional growth at the periosteum
C) Appositional growth at the epiphyseal plate (interstitial cartilage growth)
D) Remodeling of osteons

✅ Answer: C - Bone matrix is solid, so only appositional/interstitial growth at the epiphyseal plate allows length increase.

Q76. The physis (growth plate) grows longitudinally by:

A) Appositional growth
B) Interstitial growth
C) Osteoclast activity
D) Volkmann's canal formation

✅ Answer: B

Q77. The growth plate shrinks at ~14 years due to:

A) Testosterone
B) Growth hormone decline
C) Estrogen
D) Calcitonin

✅ Answer: C

Q78. Articular cartilage:

A) Ossifies at puberty
B) Is replaced by the epiphyseal line
C) Does not ossify and persists throughout life
D) Converts to fibrocartilage in adults

✅ Answer: C

Q79. Growth in bone WIDTH occurs by:

A) Interstitial growth of chondrocytes
B) Appositional growth - osteoblasts add layers on the outside while osteoclasts resorb from the inside
C) Remodeling of epiphyseal plate cartilage
D) Periosteal cartilage proliferation

✅ Answer: B

SECTION 10: Factors Affecting Bone Growth

Q80. Vitamin D is necessary for bone growth because it:

A) Stimulates osteoblast activity directly
B) Is required for synthesis of collagen
C) Increases calcium absorption from the intestines
D) Directly deposits hydroxyapatite in bone

✅ Answer: C

Q81. Rickets is caused by a deficiency of:

A) Vitamin C during childhood
B) Vitamin D during childhood
C) Calcium in adulthood
D) Growth hormone

✅ Answer: B

Q82. Osteomalacia is:

A) Vitamin C deficiency in children
B) Lack of Vitamin D in adulthood, leading to softening of bones
C) Loss of bone mass due to menopause
D) Deficiency of calcium causing brittle bones

✅ Answer: B

Q83. Vitamin C is necessary for bone because it:

A) Increases calcium absorption
B) Stimulates osteoclast activity
C) Is required for collagen synthesis by osteoblasts
D) Activates growth hormone receptors

✅ Answer: C

Q84. Scurvy is caused by deficiency of:

A) Vitamin D
B) Vitamin A
C) Vitamin B12
D) Vitamin C

✅ Answer: D

Q85. Vitamin A controls:

A) Calcium absorption from the gut
B) Collagen synthesis
C) Activity, distribution, and coordination of osteoblasts and osteoclasts
D) Protein synthesis in osteocytes

✅ Answer: C

Q86. Vitamin B12 deficiency may:

A) Inhibit osteoclast activity
B) Inhibit osteoblast activity
C) Cause rickets
D) Reduce calcium absorption

✅ Answer: B

Q87. Growth hormone from the anterior pituitary:

A) Causes closure of epiphyseal plates
B) Stimulates interstitial cartilage growth and appositional bone growth
C) Decreases calcium absorption
D) Inhibits osteoblasts

✅ Answer: B

Q88. Sex hormones (estrogen and testosterone) have what dual effect on bone?

A) Stimulate osteoclast activity and decrease bone density
B) Cause growth at puberty AND cause closure of the epiphyseal plates
C) Only close epiphyseal plates without stimulating growth
D) Have no effect until after age 25

✅ Answer: B

Q89. Thyroid hormones are required for:

A) Closure of the epiphyseal plate only
B) Calcium absorption in intestines
C) Growth of all tissues including bone
D) Production of osteoclasts

✅ Answer: C

Q90. Which mineral is primarily responsible for the hardness of bone matrix?

A) Magnesium
B) Manganese
C) Calcium (as hydroxyapatite)
D) Boron

✅ Answer: C

SECTION 11: Bone Remodeling

Q91. Bone remodeling involves:

A) Osteoblasts only
B) Osteoclasts only
C) Both osteoclasts (removing old bone) and osteoblasts (forming new bone)
D) Chondroblasts replacing bone with cartilage

✅ Answer: C

Q92. What percentage of bone mass is turned over approximately each week?

A) 1%
B) 5%
C) 10%
D) 20%

✅ Answer: B

Q93. Wolff's Law states that:

A) Bone growth is entirely genetically determined
B) The shape of bone is altered by mechanical forces
C) Osteoclasts are always more active than osteoblasts
D) Calcium levels in blood control bone density directly

✅ Answer: B

Q94. In compact bone remodeling, new osteons are formed by:

A) Osteoclasts entering the osteon from blood in the central canal and removing lamellae, then osteoblasts replacing bone
B) Chondroblasts forming new cartilage templates
C) Periosteal cells invading from outside
D) Volkmann's canals expanding

✅ Answer: A

Q95. Interstitial lamellae represent:

A) Newly formed lamellae at the bone periphery
B) Remnants of osteons that were replaced through remodeling
C) Lamellae of spongy bone only
D) Lamellae surrounding Volkmann's canals

✅ Answer: B

SECTION 12: Calcium Homeostasis

Q96. The two hormones controlling blood calcium levels are:

A) Growth hormone and thyroid hormone
B) Parathyroid hormone (PTH) and calcitonin
C) Insulin and estrogen
D) Aldosterone and cortisol

✅ Answer: B

Q97. Parathyroid hormone (PTH) acts to:

A) Decrease blood calcium by stimulating osteoblasts
B) Increase blood calcium by stimulating bone resorption and maximizing renal tubular reabsorption of calcium
C) Inhibit osteoclast activity
D) Stimulate calcitonin release

✅ Answer: B

Q98. Calcitonin acts to:

A) Increase blood calcium levels
B) Stimulate osteoclast activity
C) Decrease blood calcium levels by reducing bone resorption
D) Stimulate parathyroid hormone release

✅ Answer: C

Q99. When osteoblasts create new bone, blood calcium:

A) Increases
B) Decreases (calcium enters bone)
C) Stays the same
D) First increases, then decreases

✅ Answer: B

Q100. When osteoclasts break down bone, blood calcium:

A) Decreases
B) Stays the same
C) Increases (calcium leaves bone into blood)
D) Triggers calcitonin to further break down bone

✅ Answer: C

SECTION 13: Bone Repair

Q101. The correct sequence of bone repair steps is:

A) Callus ossification → Hematoma → Callus formation → Remodeling
B) Hematoma formation → Callus formation → Callus ossification → Bone remodeling
C) Callus formation → Hematoma → Ossification → Remodeling
D) Remodeling → Callus ossification → Hematoma → Callus formation

✅ Answer: B

Q102. A callus is:

A) A hematoma at the fracture site
B) A mass of tissue that forms at a fracture site and connects broken bone ends
C) New lamellar bone formed directly after fracture
D) A blood clot only

✅ Answer: B

Q103. During internal callus formation, which cells produce the cartilage component?

A) Osteoblasts from the periosteum
B) Monocyte-derived osteoclasts
C) Chondroblasts from osteochondral progenitor cells of periosteum and endosteum
D) Fibroblasts from surrounding muscle

✅ Answer: C

Q104. In bone repair, macrophages and osteoclasts serve to:

A) Produce new collagen and bone matrix
B) Clean up debris and break down dead tissue
C) Form the external callus collar
D) Stimulate PTH secretion

✅ Answer: B

Q105. The final stage of bone repair results in:

A) Woven bone covering the fracture site permanently
B) Replacement of cancellous bone/callus by compact bone, sculpted by osteoclasts
C) Cartilage remaining at the repair site
D) Formation of a permanent hematoma

✅ Answer: B

SECTION 14: Bone Fracture Types

Q106. An open (compound) fracture is defined as:

A) A fracture that does not cross the entire bone
B) A fracture with an open wound - bone may protrude through skin
C) A fracture in which one fragment is driven into the other
D) A fracture that radiates from a central point

✅ Answer: B

Q107. A greenstick fracture is:

A) A complete fracture into more than two pieces
B) An impacted fracture in children
C) An incomplete fracture on the convex side of the curve of a bone
D) A fracture where bone ends do not separate

✅ Answer: C

Q108. A comminuted fracture is:

A) A fracture that does not cross the entire bone
B) A complete fracture where bone breaks into more than two pieces
C) A fracture with no skin perforation
D) A hairline fracture

✅ Answer: B

Q109. A hairline fracture is:

A) An incomplete fracture where the two sections of bone do not separate
B) A fracture that radiates from a central point
C) A fracture in long bones only
D) A fracture with a rough, toothed broken edge

✅ Answer: A

Q110. An impacted fracture occurs when:

A) Bone breaks into many fragments
B) One bone fragment is driven into the cancellous portion of the other fragment
C) Bone is broken on the convex side only
D) The fracture runs along the long axis

✅ Answer: B

Q111. A stellate fracture is characterized by:

A) A spiral pattern along the bone shaft
B) Rough, toothed broken ends
C) Fracture lines radiating out from a central point
D) A fracture that does not cross the entire bone

✅ Answer: C

SECTION 15: Aging & Bone

Q112. Peak bone mass in humans is achieved at approximately what age?

A) Age 18
B) Age 25
C) Age 30
D) Age 40

✅ Answer: C

Q113. After menopause, the rate of bone loss:

A) Decreases
B) Stays the same
C) Increases 10-fold
D) Increases 2-fold

✅ Answer: C

Q114. In aging, which type of bone is lost FIRST?

A) Compact bone
B) Cancellous (trabecular) bone
C) Cortical bone
D) Periosteal bone

✅ Answer: B

Q115. Men have denser bones than women primarily because of:

A) Higher calcitonin levels
B) Greater vitamin D metabolism
C) Testosterone and greater body weight
D) Higher growth hormone levels

✅ Answer: C

Q116. In osteoporosis, there is:

A) Equal rates of bone formation and resorption
B) Increased bone formation exceeding resorption
C) An imbalance between bone resorption and bone formation (resorption exceeds formation)
D) Only decreased osteoclast activity

✅ Answer: C

Q117. Common osteoporotic fracture sites include all of the following EXCEPT:

A) Wrist
B) Hip
C) Spine
D) Tibia shaft

✅ Answer: D - Common sites are wrist, hip, and spine - all have high trabecular:cortical bone ratios.

SECTION 16: Bone Marrow

Q118. Red bone marrow is found in adults in:

A) The medullary cavity of all long bones
B) The axial skeleton, girdles, and epiphyses of femur and humerus
C) Only the skull bones
D) Volkmann's canals

✅ Answer: B

Q119. Yellow bone marrow is primarily composed of:

A) Active hematopoietic tissue
B) Fat
C) Red blood cell precursors
D) Collagen fibers

✅ Answer: B

Q120. Hematopoiesis in adults primarily occurs in:

A) Yellow marrow of limb bones
B) Red marrow of axial skeleton and epiphyses of femur/humerus
C) Periosteum
D) Endosteum

✅ Answer: B

SECTION 17: Comparison & High-Yield Integrative Questions

Q121. Which statement correctly compares spongy and compact bone?

A) Spongy bone contains osteons; compact bone has trabeculae
B) Compact bone contains osteons and lamellae; spongy bone has trabeculae with no true osteons
C) Only compact bone contains osteocytes
D) Spongy bone is always found on the surface of bones

✅ Answer: B

Q122. The diaphysis of a long bone consists primarily of which tissue?

A) Spongy bone surrounding the medullary cavity
B) Compact bone surrounding the central marrow cavity
C) Hyaline cartilage
D) Fibrocartilage

✅ Answer: B

Q123. Flat bones (e.g., skull) are composed of:

A) Compact bone only
B) Cancellous bone sandwiched between two layers of compact bone (diploe)
C) Spongy bone surrounded by compact bone - like epiphyses
D) Hyaline cartilage core with bone on surface

✅ Answer: B

Q124. Articular surfaces of bones are covered by:

A) Fibrocartilage with perichondrium
B) Hyaline cartilage without perichondrium
C) Elastic cartilage
D) Compact bone only

✅ Answer: B

Q125. Which cell type would be MOST ACTIVE during fracture healing in the early phase?

A) Osteocytes maintaining existing bone
B) Osteochondral progenitor cells differentiating into chondroblasts and osteoblasts
C) Osteoclasts only
D) Yellow marrow adipocytes

✅ Answer: B

Q126. Endochondral ossification differs from intramembranous ossification in that it:

A) Only occurs in flat bones
B) Requires a pre-existing cartilage model that is replaced by bone
C) Involves direct differentiation of mesenchymal cells to osteoblasts
D) Produces only woven bone permanently

✅ Answer: B

Q127. Which hormone, if deficient, would prevent proper bone growth in ALL tissues?

A) Estrogen
B) PTH
C) Thyroid hormone
D) Calcitonin

✅ Answer: C - Thyroid hormone is required for growth of all tissues.

Q128. A child presents with soft, bowed leg bones. The most likely diagnosis is:

A) Osteoporosis
B) Rickets (Vitamin D deficiency)
C) Osteomalacia
D) Scurvy

✅ Answer: B - Rickets = Vitamin D deficiency in childhood.

Q129. An adult with insufficient Vitamin D develops softening of bones. This is called:

A) Rickets
B) Scurvy
C) Osteomalacia
D) Osteoporosis

✅ Answer: C

Q130. Calcium enters bone when ________ are active; calcium leaves bone when ________ are active:

A) Osteoclasts; Osteoblasts
B) Osteoblasts; Osteoclasts
C) Osteocytes; Osteoblasts
D) Chondroblasts; Osteoclasts

✅ Answer: B

📊 Quick-Reference Summary Table

Topic	Key Fact
Osteoblast	Builds bone, collagen via ER/Golgi, communicates via gap junctions
Osteocyte	Mature bone cell, in lacunae, stellate shape
Osteoclast	Resorbs bone, ruffled border, multinucleated, from monocytes
Osteon	Structural unit of compact bone
Haversian canal	Parallel to long axis, contains blood vessels
Volkmann's canal	Perpendicular to long axis, connects Haversian canals
Lacunae	Space containing osteocyte body
Canaliculi	Canal containing osteocyte processes
Woven bone	Random collagen, first bone formed
Lamellar bone	Mature, organized in sheets
PTH	Increases blood Ca²⁺
Calcitonin	Decreases blood Ca²⁺
Vitamin D deficiency (child)	Rickets
Vitamin D deficiency (adult)	Osteomalacia
Vitamin C deficiency	Scurvy (poor collagen synthesis)
Intramembranous	Flat bones: skull, mandible, clavicle
Endochondral	Most bones: long bones, vertebrae, pelvis
Epiphyseal plate closes	Age ~16–25 years
Peak bone mass	Age ~30

Total: 130 MCQs covering every topic in your lecture.

Good luck on your exam tomorrow! 🎯

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