Cellular Injury and Adaptation.**** 1.Mechanisms of Cell injury, Free radical induced cell injury** 2.Difference - Reversible and irreversible Cell injury 3. Fatty change - etiopathogenesis, Fatty liver- causes,types and morphology* 4.Pigments - classify and describe. Describe disorders associated with Hemoprotein derived pigments* 5.Brown atrophy of heart* 6.Necrosis - types,examples,causes and morphology 7.Caseous necrosis, Coagulative and liquefactive Necrosis in detail.** 8. Apoptosis - define,examples,causes,mechanisms And morphological changes 9.Difference Between Dystrophic and Metastatic Calcification* 10.Difference between Dry and wet gangrene* 11.Adaptation- define, Atrophy,Metaplasia, Hypertrophy,Hyperplasia- mechanism,examples** 12.Cellular ageing- define,mechanism. 2 MBBS refer robbins answer in detail as systemic for muhs exam draw colour diagrams for exam as well answer covering all imp pointsband most frequently ask questions as well
What's Covered (All 12 Topics - MUHS Ready)
| # | Topic | Coverage |
|---|---|---|
| 1 | Mechanisms of Cell Injury + Free Radicals ⭐⭐ | ATP depletion cascade, Ca²⁺ influx, Fenton reaction, antioxidants, reperfusion injury |
| 2 | Reversible vs Irreversible Injury | Full comparison table, hallmarks, point of no return |
| 3 | Fatty Change / Fatty Liver ⭐ | 6 mechanisms, causes, macro/micro vs microvesicular, Oil Red O stain |
| 4 | Pigments + Hemoprotein disorders ⭐ | Full classification, hemosiderin/bilirubin/hematin/hematoidin/porphyrins, hemochromatosis |
| 5 | Brown Atrophy of Heart ⭐ | Lipofuscin, gross/micro appearance, causes |
| 6 | Necrosis - all types | All 6 types with causes, morphology, examples |
| 7 | Caseous, Coagulative, Liquefactive ⭐⭐ | Detailed mechanisms, Langhans giant cells, ghost cells, granuloma diagrams |
| 8 | Apoptosis ⭐⭐ | Intrinsic + extrinsic pathways, caspase cascade, vs necrosis comparison |
| 9 | Dystrophic vs Metastatic Calcification ⭐ | Full comparison, mechanisms, causes of hypercalcemia |
| 10 | Dry vs Wet Gangrene ⭐ | Full comparison table + Gas gangrene |
| 11 | Adaptations ⭐⭐ | Atrophy, Hypertrophy, Hyperplasia, Metaplasia - all with mechanisms, examples, clinical significance |
| 12 | Cellular Aging ⭐ | Telomere shortening, Hayflick limit, ROS, sirtuins, proteostasis |
Tips for the MUHS Exam:
- Draw the granuloma diagram for caseous necrosis - Langhans giant cell with horseshoe nuclei always scores marks
- Draw the apoptosis pathway - both intrinsic and extrinsic with caspase cascade
- Comparison tables (reversible vs irreversible, necrosis vs apoptosis, dystrophic vs metastatic, dry vs wet gangrene) are direct 5-mark questions
- Free radicals question - always include Fenton reaction and the three targets (lipids, proteins, DNA)
- The ⭐⭐ topics (1, 6/7, 8, 11) are the most likely long essay (10-mark) questions