Questions
3–5 questions per semester exam
Difficulty
Medium
Importance
High yield for University Professional Exams
Overview
General Pathology serves as the fundamental bridge between basic biological sciences and clinical practice, focusing on the body's response to disease. Mastering this topic is essential as it explains the morphological and functional changes in cells and tissues, providing the diagnostic vocabulary required for all medical and paramedical disciplines.
Cell Injury and Adaptation
Cell injury occurs when stress exceeds the cell's adaptive capacity, leading to either reversible or irreversible damage. Understanding these processes is critical for distinguishing between hypertrophy, hyperplasia, atrophy, and metaplasia.
- Reversible injury: Cellular swelling and fatty change
- Irreversible injury: Necrosis and apoptosis
- Hypertrophy: Increase in cell size
- Hyperplasia: Increase in cell number
- Atrophy: Decrease in cell size and function
- Metaplasia: Reversible replacement of one adult cell type by another
Inflammation
Inflammation is a complex vascular and cellular response aimed at eliminating the initial cause of cell injury and clearing out necrotic cells. You must differentiate between acute (rapid onset, neutrophil-rich) and chronic (prolonged, mononuclear cell-rich) inflammation.
- Five cardinal signs: Rubor, tumor, calor, dolor, functio laesa
- Acute inflammation: Predominantly polymorphonuclear neutrophils
- Chronic inflammation: Infiltration of macrophages, lymphocytes, and plasma cells
- Chemical mediators: Histamine, prostaglandins, and cytokines
- Formation of granulomas in chronic granulomatous inflammation
Neoplasia Basics
Neoplasia implies an abnormal, uncontrolled proliferation of cells that continues after the stimulus is removed. Students must be able to contrast benign and malignant tumors based on differentiation, rate of growth, local invasion, and metastasis.
- Benign tumors: Slow growth, well-differentiated, capsule present
- Malignant tumors: Rapid growth, poorly differentiated, invasive
- Metastasis: Spread of tumor cells to distant sites
- Anaplasia: Hallmark of malignancy characterized by lack of differentiation
- Carcinoma vs. Sarcoma nomenclature
Exam Tip
Always use flowcharts or labeled diagrams to contrast benign vs. malignant features, as examiners prioritize structural clarity over long paragraphs.
Common Mistakes
- Confusing the terminology of hyperplasia with hypertrophy in written exam answers.
- Failing to explicitly mention the role of neutrophils in acute vs lymphocytes in chronic inflammation.
- Overlooking the definition of 'anaplasia' when describing malignant tumors.
More Revision Notes
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