Choose, age-related changes in the artery wall consist in: a. its compaction b. accumulation of sulfated glycosaminoglycans c. thickening of collagen fibers d. thickening of elastic fibers and membranes
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The textbook passage from Braunwald's Heart Disease confirms the answer clearly. Here is the full breakdown:
Age-Related Changes in the Artery Wall
The correct answers are a, b, and c.
Option-by-Option Analysis
| Option | Correct? | Explanation |
|---|---|---|
| a. Compaction (stiffening) | YES | The arterial wall stiffens with age due to collagen cross-linking, calcium deposition, and elastin degradation. This reduces distensibility and increases pulse wave velocity. |
| b. Accumulation of sulfated glycosaminoglycans | YES | Smooth muscle cells secrete excess glycosaminoglycans into the extracellular matrix with age, contributing to wall remodeling and altered biomechanics. |
| c. Thickening of collagen fibers | YES | Aging leads to increased collagen content, enzymatic cross-linking of extracellular matrix molecules, and irreversible non-enzymatic glycation forming AGEs - all of which thicken and stiffen collagen fibers. |
| d. Thickening of elastic fibers and membranes | NO | This is the opposite of what happens. Elastic fibers fray and fragment with age ("fraying of elastic fibers"), along with increased elastase activity. This elastin degradation is a key contributor to arterial stiffness and systolic hypertension. |
Summary of Arterial Aging (from Braunwald's Heart Disease)
Advancing age causes:
- Smooth muscle cell hypertrophy and extracellular matrix accumulation → intimal-medial thickening
- Fraying/fragmentation of elastic fibers (NOT thickening) + increased elastase activity
- Increased collagen production and cross-linking (enzymatic + AGE-based non-enzymatic)
- Glycosaminoglycan accumulation
- Calcium deposition
- Net result: reduced distensibility, increased arterial stiffness/compaction, and systolic hypertension
The key distractor in this question is option d - elastic fibers degrade and thin with age, not thicken. The answer is a, b, c.
- Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, "Vasculature" / "Age-Associated Changes in Cardiovascular Structure and Function"
Choose, age-related changes in the artery wall consist in: a. its compaction b. accumulation of sulfated glycosaminoglycans c. thickening of collagen fibers d. thickening of elastic fibers and membranes correct option is.?
Based on the textbook evidence already retrieved in this conversation (Braunwald's Heart Disease), the correct options are:
✅ Correct Answers: a, b, and c
| Option | Verdict | Reason |
|---|---|---|
| a. Compaction (stiffening) | CORRECT | Arterial wall stiffens due to collagen cross-linking, calcium deposition, and elastin degradation - reducing distensibility |
| b. Accumulation of sulfated glycosaminoglycans | CORRECT | Smooth muscle cells secrete excess glycosaminoglycans into the extracellular matrix with age, contributing to wall remodeling |
| c. Thickening of collagen fibers | CORRECT | Increased collagen production, enzymatic cross-linking, and AGE (advanced glycation end-product) formation thickens and stiffens collagen |
| d. Thickening of elastic fibers and membranes | INCORRECT | This is the key distractor. Elastic fibers fray and fragment with age - they do NOT thicken. Elastin degradation is one of the primary drivers of arterial stiffness in aging |
Why d is Wrong
Braunwald's explicitly states: "advancing age leads to fraying of elastic fibers" along with increased elastase activity. This is the opposite of thickening - elastic fibers degrade and break down, which paradoxically contributes to the overall wall stiffness alongside collagen changes.
Answer: a, b, c
- Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, "Age-Associated Changes in Cardiovascular Structure and Function"
Choose where there are vessels of vessels? a. arteries b. veins c. lymphatic vessels d. in veins and lymphatic vessels e. in all vessel
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The textbooks give a clear, detailed answer.
✅ Correct Answer: a and b (arteries and veins) — but the most complete answer is e: in all vessels ... with an important caveat
Actually, based on what the histology textbooks explicitly state, the best answer is:
✅ a and b — Arteries and Veins (large ones)
Here is the precise breakdown from two authoritative histology textbooks:
What is "Vasa Vasorum"?
Vasa vasorum (Latin: "vessels of vessels") are small nutrient vessels that supply the walls of large blood vessels - their own private blood supply, since the vessel wall is too thick to receive nutrients purely by diffusion from the lumen.
Where Are They Found?
| Vessel Type | Vasa Vasorum Present? | Notes |
|---|---|---|
| Large arteries (elastic, muscular >1mm) | YES | In tunica adventitia and outer media |
| Large veins | YES | Even MORE vasa vasorum than arteries, because they carry deoxygenated blood |
| Small arteries (<0.5-1 mm lumen) | No | Wall thin enough for direct diffusion |
| Arterioles / capillaries / venules | No | Too small |
| Lymphatic vessels (large trunks) | Yes, but rarely discussed | Minor |
"Because they carry deoxygenated blood, large veins commonly have more vasa vasorum than arteries."
- Junqueira's Basic Histology, 17e
"In humans, vessels with a lumen of less than 0.5 mm in diameter usually do not have a vasa vasorum."
- Histology: A Text and Atlas (Pawlina)
Final Answer for This Question
The answer is a and b — arteries and veins (specifically large ones).
- Lymphatic vessels (option c) do have vasa vasorum in their large trunks, but this is not a classical teaching point
- Option d ("in veins and lymphatic vessels") excludes arteries, which is wrong - arteries absolutely have vasa vasorum
- Option e ("in all vessels") is wrong - small vessels, arterioles, capillaries, and venules do NOT have vasa vasorum
Answer: a and b (large arteries and large veins)
- Junqueira's Basic Histology, Text and Atlas 17e, "Vasculature"
- Histology: A Text and Atlas with Correlated Cell and Molecular Biology (Pawlina)
100. The capillary electronogram clearly defines the fenestras in the endothelium and the time in the basement Omembrane. What is the type of capillary?a. sinusoidal; b. visceral; c. shunt; d. atypical; e. somatic.
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✅ Correct Answer: b. Visceral (Fenestrated) capillary
The key features in the question are:
- Fenestras (fenestrations) in the endothelium ✓
- Thin but CONTINUOUS basement membrane ✓
These two features together define the fenestrated capillary, also called the visceral type.
The Three Capillary Types Compared
| Feature | Somatic (Continuous) | Visceral (Fenestrated) ✅ | Sinusoidal (Discontinuous) |
|---|---|---|---|
| Endothelium | Continuous, no pores | Fenestrations (pores) present | Large gaps + large fenestrations |
| Basement membrane | Continuous | Continuous (thin) | Discontinuous / absent |
| Permeability | Low | Moderate-high | Very high |
| Found in | Muscle, skin, lung, brain | Kidneys, intestine, endocrine glands, choroid plexus | Liver, spleen, bone marrow |
Why the Other Options Are Wrong
| Option | Why Wrong |
|---|---|
| a. Sinusoidal | Has LARGE gaps in endothelium AND a discontinuous/absent basement membrane - not matching the question |
| c. Shunt | Not a standard capillary classification in histology |
| d. Atypical | Not a recognized capillary type |
| e. Somatic | Continuous capillary - NO fenestrations, tight junctions only |
"Fenestrated capillaries also have tight junctions, but perforations (fenestrations) through the endothelial cells themselves allow greater exchange... The basement membrane is continuous in both [continuous and fenestrated] capillary types."
- Junqueira's Basic Histology, 17e
The question's clue "thin basement membrane" (continuous but thin) rules out sinusoidal (which has a discontinuous/absent basement membrane), confirming the answer is the visceral/fenestrated type.
Answer: b. Visceral (fenestrated capillary)
- Junqueira's Basic Histology, Text and Atlas 17e, "Capillary Beds"
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