Weekly Pathology Exam - September 4, 2026 (Sections B & C) | Essay Questions | Ompath Study

Practice 5 structured short- and long-answer medical questions on Weekly Pathology Exam - September 4, 2026 (Sections B & C). Review model answers for exam r...

Essay Questions and Answers

1. Q1. Describe the key morphological features of apoptosis and explain its physiological significance in multicellular organisms.

   Answer: Apoptosis is characterized by cell shrinkage, chromatin condensation (pyknosis), nuclear fragmentation (karyorrhexis), and formation of apoptotic bodies. These bodies are then phagocytosed by surrounding cells or macrophages. Physiologically, apoptosis is crucial for development (e.g., digit formation), tissue homeostasis (removing old or damaged cells), and immune system regulation (eliminating self-reactive lymphocytes).

2. Q2. Differentiate between metaplasia and dysplasia, providing an example of each.

   Answer: Metaplasia is a reversible adaptive change where one differentiated cell type is replaced by another. An example is squamous metaplasia in the bronchial epithelium of smokers. Dysplasia is a precancerous change characterized by abnormal cellular proliferation and maturation, often preceding malignant transformation. An example is cervical dysplasia (CIN).

3. Q3. Explain the process of inflammation, including the key cellular and vascular events.

   Answer: Inflammation is a protective response to injury or infection. Key vascular events include vasodilation (leading to redness and heat) and increased vascular permeability (leading to edema). Key cellular events involve the recruitment of leukocytes (neutrophils, then macrophages) to the site of injury via margination, adhesion, diapedesis, and chemotaxis. These cells then clear the injurious agent and initiate repair.

4. Q4. What are oncogenes and tumor suppressor genes? Provide an example of each and briefly explain their role in carcinogenesis.

   Answer: Oncogenes are mutated proto-oncogenes that promote cell growth and proliferation. An example is RAS. Tumor suppressor genes normally inhibit cell proliferation. Examples include p53 and RB. Loss of function or inactivation of tumor suppressor genes can lead to uncontrolled cell division and tumor formation.

5. Q5. Discuss the pathogenesis and pathological features of atherosclerosis. Include in your answer the role of lipid metabolism, inflammation, and endothelial dysfunction. Elaborate on the complications of atherosclerosis and their clinical manifestations.

   Answer: Pathogenesis of atherosclerosis involves endothelial dysfunction, leading to increased permeability and adhesion molecule expression. Lipoproteins, particularly LDL, accumulate in the intima and undergo oxidation. This triggers an inflammatory response, recruiting macrophages that engulf oxidized LDL, forming foam cells. Smooth muscle cells migrate and proliferate, contributing to plaque formation. Key stages include fatty streak formation, plaque progression, and plaque rupture. Endothelial dysfunction is the initiating event, impairing vasodilation and promoting thrombosis. Lipid metabolism is central, with high LDL cholesterol levels being a major risk factor. Inflammation is integral, with cytokines and chemokines recruiting leukocytes. Complications arise from plaque rupture, leading to thrombosis and vessel occlusion. These include myocardial infarction (coronary artery occlusion), stroke (cerebral artery occlusion), peripheral artery disease (limb ischemia), and renal artery stenosis (hypertension).