General Pathology

General Pathology Indian Medical PG Question 1: Final common pathway of metabolism of carbohydrates, lipids and proteins is?

• A. Gluconeogenesis
• B. Glycogenesis
• C. TCA cycle (Correct Answer)
• D. None of the options

General Pathology Explanation: ***TCA cycle*** - The **TCA cycle** (also known as the **Krebs cycle** or **citric acid cycle**) is the central metabolic pathway through which acetyl-CoA, derived from the breakdown of carbohydrates, fats, and proteins, is oxidized to produce energy. - Intermediates of the breakdown of **glucose (pyruvate)**, **fatty acids (acetyl-CoA)**, and **certain amino acids (keto acids)** feed into the TCA cycle, making it the final common pathway. *Gluconeogenesis* - **Gluconeogenesis** is the process of synthesizing glucose from non-carbohydrate precursors, primarily occurring in the liver and kidneys. - It is an anabolic pathway that creates glucose, rather than a catabolic pathway for energy generation from diverse macromolecules. *Glycogenesis* - **Glycogenesis** is the process of synthesizing glycogen from glucose, primarily in the liver and muscles, for storage. - It is a specific anabolic pathway for glucose storage and not a common pathway for the metabolism of all three major macronutrients. *None of the options* - The TCA cycle is indeed the final common pathway for the complete oxidation of carbohydrates, lipids, and proteins, making this option incorrect. - All major macronutrients are ultimately broken down to molecules that enter the TCA cycle.

General Pathology Indian Medical PG Question 2: What is the correct order of the normal phases of wound healing?

• A. Haemostatic phase → Inflammatory phase → Proliferative phase → Remodelling phase (Correct Answer)
• B. Proliferative phase → Haemostatic phase → Inflammatory phase → Remodelling phase
• C. Remodelling phase → Proliferative phase → Destructive phase → Inflammatory phase
• D. Destructive phase → Proliferative phase → Remodelling phase → Inflammatory phase

General Pathology Explanation: ***Haemostatic phase → Inflammatory phase → Proliferative phase → Remodelling phase*** - This sequence accurately describes the well-established biological progression of **wound healing**, starting with immediate injury response and leading to tissue maturation [1], [2]. - Each phase builds upon the previous one, ensuring proper clot formation, immune response, tissue repair, and final strengthening of the wound [1], [2]. *Proliferative phase → Haemostatic phase → Inflammatory phase → Remodelling phase* - This order is incorrect because the **proliferative phase** occurs much later than the initial haemostatic and inflammatory responses [1]. - **Haemostasis** must occur first to stop bleeding before subsequent healing processes can begin effectively [2]. *Remodelling phase → Proliferative phase → Destructive phase → Inflammatory phase* - This option is incorrect as the **remodelling phase** is the final stage of wound healing, not the initial one [1]. - The term "**destructive phase**" is not a standard physiological phase in normal wound healing. *Destructive phase → Proliferative phase → Remodelling phase → Inflammatory phase* - This sequence is incorrect because, similar to the previous option, "**destructive phase**" is not a recognized normal phase of wound healing. - The **inflammatory phase** occurs early in the process, not as the final stage [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 117-119. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 105-108.

General Pathology Indian Medical PG Question 3: Which is NOT a feature of chronic inflammation?

• A. Mononuclear cells
• B. Neutrophil predominance (Correct Answer)
• C. Fibrosis
• D. Granulation tissue

General Pathology Explanation: ***Neutrophil predominance*** - **Neutrophil predominance** is characteristic of **acute inflammation**, where these cells are among the first responders to injury or infection [1]. - In chronic inflammation, neutrophils are typically present in much smaller numbers compared to mononuclear cells, or their presence indicates an acute exacerbation [3]. *Mononuclear cells* - **Mononuclear cells**, such as **macrophages**, **lymphocytes**, and **plasma cells**, are the hallmark cellular infiltrates of chronic inflammation [1]. - These cells are responsible for sustained immune responses, tissue destruction, and repair processes [2]. *Fibrosis* - **Fibrosis**, or the deposition of **collagen** by fibroblasts, is a common outcome of chronic inflammation as the body attempts to repair ongoing tissue damage [3]. - It leads to **scarring** and functional impairment of affected organs [4]. *Granulation tissue* - **Granulation tissue** is an early phase of **tissue repair** during chronic inflammation, characterized by the proliferation of **fibroblasts** and new **blood vessels (angiogenesis)** [5]. - It represents the body's effort to fill tissue defects and prepare for eventual fibrous scar formation [5]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 195-196. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 107-109. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 196-197. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 200-202. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 194-195.

General Pathology Indian Medical PG Question 4: Which of the following is an example of programmed cell death?

• A. Apoptosis (Correct Answer)
• B. Cytolysis
• C. Necrosis
• D. Autophagy

General Pathology Explanation: ***Apoptosis*** - Apoptosis is a form of **programmed cell death** [1], essential for normal cellular turnover and development. - It is characterized by cellular shrinkage, chromatin condensation, and membrane blebbing, without provoking an inflammatory response [4]. *Cytolysis* - Cytolysis refers to the **destruction of cells by external agents**, such as toxins or pathogens, leading to membrane rupture. - It typically results in **inflammation** and is not a programmed or controlled process like apoptosis. *Necrosis* - Necrosis is an **uncontrolled form of cell death** resulting from acute cellular injury, leading to inflammation and damage to surrounding tissues. - Unlike apoptosis, necrosis involves rapid cell swelling and bursting of cell membranes, causing inflammation. However, some forms of necrosis can be programmed, such as necroptosis [2][3]. *Proptosis* - Proptosis refers to **eye bulging** (exophthalmos), often due to thyroid disease or certain tumors, and is not related to cell death. - It does not involve a process of cell death but rather anatomical displacement of the eyeball. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 63-64. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 71. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 69-71. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 67-69.

General Pathology Indian Medical PG Question 5: What is the histopathological finding 12 hours after ischemic injury to heart?

• A. Neocapillary invasion of myocytes
• B. Hyper-eosinophilia of myocytes (Correct Answer)
• C. Karyorrhexis of myocytes
• D. Coagulation necrosis of myocytes

General Pathology Explanation: ***Hyper-eosinophilia of myocytes*** - Within **4-12 hours** of myocardial ischemia, the most characteristic histological finding is the development of **hypereosinophilia** in the sarcoplasm of myocardial cells [1]. - This is due to the loss of **glycogen** and an increase in **cytoplasmic protein binding** to eosin, indicating early irreversible cell injury [1], [2]. *Neocapillary invasion of myocytes* - **Neocapillary invasion** is a feature of **healing** and **repair** processes, usually observed much later, typically days to weeks after the initial injury, to facilitate scar formation [1]. - This process involves the growth of **new blood vessels** into the damaged tissue. *Karyorrhexis of myocytes* - **Karyorrhexis**, the fragmentation of the cell nucleus, is a later stage of necrosis, usually becoming apparent **12-24 hours post-infarction** [1]. - In the initial 12 hours, nuclear changes like **pyknosis** (nuclear shrinkage and increased basophilia) might be observed, but karyorrhexis is not prominent [1]. *Coagulation necrosis of myocytes* - While myocardial infarction is characterized by **coagulation necrosis**, the classic histological signs of full-blown coagulation necrosis, such as loss of striations and nuclear changes, become prominent at **12-24 hours and beyond** [1]. - In the first 12 hours, **hypereosinophilia** is the primary early indicator of this necrotic process, preceding the more overt classical features [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 548-550.

General Pathology Indian Medical PG Question 6: Which of the following ions is important in irreversible cell injury?

• A. Sodium
• B. Chloride
• C. Calcium (Correct Answer)
• D. Potassium

General Pathology Explanation: ***Calcium*** - An increase in intracellular **calcium** concentration is a critical event in irreversible cell injury, activating various destructive enzymes like **phospholipases**, **proteases**, **endonucleases**, and ATPases [1]. - This influx of calcium can occur due to mitochondrial dysfunction (leading to impaired calcium sequestration) or damage to the plasma membrane [1]. *Sodium* - While important for maintaining **osmotic balance** and cell volume, dysregulation of sodium primarily contributes to **cellular swelling** (hydropic change), which is an early and often reversible sign of cell injury [1]. - Increased intracellular sodium typically leads to water influx, but its direct role in irreversible damage is secondary to calcium. *Chloride* - Changes in chloride ion distribution are often secondary to sodium dysregulation and play a role in maintaining **charge neutrality** and osmotic balance across the cell membrane. - It is not directly implicated as a primary mediator of the **enzyme activation cascade** that leads to irreversible cell damage. *Potassium* - **Potassium** is the major intracellular cation; its leakage out of the cell is a consequence of cell membrane damage, indicating loss of membrane integrity. - While significant **potassium efflux** is a sign of severe injury, it is not the initiator of the irreversible damage pathway, unlike calcium. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 57-62.

General Pathology Indian Medical PG Question 7: Which type of necrosis is most commonly associated with the spread of infection?

• A. Fibrinoid necrosis
• B. Fat necrosis
• C. Liquefactive necrosis (Correct Answer)
• D. Coagulative necrosis

General Pathology Explanation: ***Liquifactive necrosis*** - Caused by the enzymatic digestion of tissue, leading to the formation of liquid pus, typically associated with bacterial infections [1]. - Commonly occurs in the **brain** and in a tissue impacted by **pyogenic bacteria** [1], demonstrating how infection can lead to tissue damage. *Fat necrosis* - Primarily related to inflammation of fat tissue, often seen in pancreatitis or trauma to fat areas. - It is not directly caused by infections but rather by fat cell damage and necrosis, leading to **saponification**. *Fibrinoid necrosis* - Associated with **immune-mediated vascular injury**, seen in conditions like **vasculitis** or **malignant hypertension** [2]. - Characterized by the deposition of **fibrin-like protein** [2], not directly related to infectious processes. *Coagulative necrosis* - Typically occurs in ischemic conditions like myocardial infarction, where tissue architecture is preserved despite cell death. - It is not directly linked to infection spread, as it relates more to loss of blood supply rather than infectious agents. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 193-194. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 103-104.

General Pathology Indian Medical PG Question 8: Which of the following is a scoring system for severity of wound infection, and is particularly useful for surveillance and research ?

• A. Southampton grading system (Correct Answer)
• B. Apgar score
• C. Glasgow scoring system
• D. ASA classification

General Pathology Explanation: ***Southampton grading system*** - The **Southampton grading system** is specifically designed for the **severity of wound infection**, offering a clear framework for classification based on clinical signs. - Its utility in **surveillance and research** stems from its structured and reproducible assessment, allowing for consistent data collection on wound healing and infection rates. *Apgar score* - The **Apgar score** is a rapid assessment of a **newborn's health** immediately after birth, evaluating heart rate, respiratory effort, muscle tone, reflex irritability, and color. - It is not used for assessing wound infection severity. *Glasgow scoring system* - The **Glasgow Coma Scale (GCS)** is used to assess the **level of consciousness** in a person following a brain injury, comprising eye opening, verbal, and motor responses. - It is not relevant to wound infection assessment. *ASA classification* - The **American Society of Anesthesiologists (ASA) Physical Status Classification System** is used to assess a patient's **overall health before surgery**, providing an indication of anesthetic risk. - It is not used for evaluating wound infection.

General Pathology Indian Medical PG Question 9: What does the term 'pathology' specifically refer to in medical science?

• A. The examination of bodily functions
• B. The details of disease processes
• C. The explanation of disease mechanisms
• D. The study of diseases and their effects on the body (Correct Answer)

General Pathology Explanation: ***Work*** - **Pathology** focuses on the **study of disease processes** [1,2], which encompasses how diseases affect the body's function and behavior. - It refers to the **work** carried out by scientists and clinicians in understanding the **mechanisms** and effects of diseases [1]. *Details* - While pathology does involve details, it specifically investigates **disease processes** rather than just presenting details [2]. - The term does not simply mean parts or pieces, but rather the comprehensive examination of **functional impairments** due to disease. *Explains* - Although pathology seeks to explain disease mechanisms, the term more accurately describes the **field of study** rather than the act of explaining itself [1]. - It encompasses methodologies and principles, rather than merely serving as an explanation of conditions. *Function* - The term "function" generally refers to the normal activities of an organism, while pathology studies **dysfunction** inherent in disease. - It highlights **what goes wrong** rather than focusing solely on functional attributes in health [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 22-23. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 43.

General Pathology Indian Medical PG Question 10: Agarose gel electrophoresis from DNA of a population of cells as seen under ultraviolet light is shown below. What is the correct explanation for the finding seen in the band labeled as "C"?

• A. Predominantly necrotic cells
• B. Mixed population of normal and apoptotic cells
• C. A population of viable cells
• D. Apoptotic cells (Correct Answer)

General Pathology Explanation: ***Apoptotic cells*** - Band C shows a characteristic **DNA ladder pattern** with discrete bands representing fragmentation into nucleosome-sized units (multiples of ~180-200 base pairs), which is pathognomonic of **apoptosis**. [1] - During apoptosis, **endonucleases** cleave DNA at internucleosomal linker regions, creating uniform fragments that migrate as distinct bands on agarose gel electrophoresis. *Predominantly necrotic cells* - **Necrotic cell DNA** undergoes random, non-specific degradation by cellular enzymes, resulting in a continuous **smear pattern** rather than discrete bands. - The **smear appearance** reflects DNA fragments of varying sizes distributed throughout the gel, unlike the organized pattern seen in band C. *Mixed population of normal and apoptotic cells* - A mixed population would show both **intact high molecular weight DNA** (remaining near the gel origin) and the **apoptotic ladder pattern** superimposed. - Band C displays a pure ladder pattern without evidence of intact DNA, indicating a homogeneous apoptotic population. *A population of viable cells* - **Viable cells** maintain intact genomic DNA that remains as a single **high molecular weight band** near the top of the gel. - The **fragmented ladder pattern** in band C is incompatible with viable cell DNA, which should show minimal degradation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 63-64.

General Pathology Flashcard 1 of 10

Question: _____ starts as apoptosis, fails to activate caspase-8, and ends like necrosis

Answer: Necroptosis

General Pathology Flashcard 2 of 10

Question: Fat necrosis is characteristically due to _____ or trauma (e.g. breast)

Answer: acute pancreatitis

General Pathology Flashcard 3 of 10

Question: _____ first listed the four cardinal signs of inflammation

Answer: Celsus

General Pathology Flashcard 4 of 10

Question: Amyloid is Periodic-acid Schiff (PAS) _____

Answer: positive

General Pathology Flashcard 5 of 10

Question: The two MAIN mechanisms of cell death are _____ and apoptosis

Answer: necrosis

General Pathology Flashcard 6 of 10

Question: What is the most important morphological feature of irreversible cell injury on electron microscopy?_____

Answer: Amorphous floccular densities in Mitochondria

General Pathology Flashcard 7 of 10

Question: The diagnostic standard for amyloidosis is staining of _____

Answer: abdominal fat aspirate

General Pathology Flashcard 8 of 10

Question: The three zones of burns from outermost to innermost are:- Zone of _____- Zone of stasis (edema)- Zone of ischemia (coagulation)

Answer: hyperemia

General Pathology Flashcard 9 of 10

Question: Galactosemia is associated with _____ cataract

Answer: oil-drop

General Pathology Flashcard 10 of 10

Question: What type of cells are the following examples? _____

Answer: Permanent