General Pathology Practice Questions

Q: A patient with heart failure presents with worsening peripheral edema. Which of the following mechanisms contributes most directly to this finding?

Increased capillary hydrostatic pressure. ***Increased capillary hydrostatic pressure*** - In **heart failure**, the heart's inability to effectively pump blood forward leads to a **backup of blood** in the venous system. [1] - This elevated venous pressure is transmitted backward to the capillaries, increasing **capillary hydrostatic pressure**, which significantly promotes the filtration of fluid from the capillaries into the interstitial space, causing edema. [1] *Lymphatic obstruction* - **Lymphatic obstruction** typically results in **lymphedema**, which is initially non-pitting and affects specific areas due to localized lymphatic damage. - While it can cause edema, it is not the primary or most direct mechanism for generalized peripheral edema in typical **heart failure**. *Decreased plasma oncotic pressure* - **Decreased plasma oncotic pressure**, often due to conditions like **liver disease** or **nephrotic syndrome**, reduces the osmotic pull of fluid back into the capillaries. - While it can contribute to edema, this is not the most direct or primary mechanism in heart failure, where fluid retention is predominantly driven by pressure changes. *Increased vascular permeability* - **Increased vascular permeability**, often seen in **inflammation** or **allergic reactions**, allows proteins and fluid to leak out of capillaries, forming exudative edema. - This is rarely the main cause of the widespread, **pitting edema** seen in heart failure, which is transudative and primarily pressure-driven.

Q: Which of the following is considered the prototype anti-apoptotic gene?

Bcl-2. ***Bcl-2*** - **Bcl-2** (B-cell lymphoma 2) was the first anti-apoptotic gene discovered and is considered the prototype due to its role in preventing programmed cell death [1]. - Its overexpression is commonly seen in lymphomas and other cancers, where it helps cancer cells survive by inhibiting apoptosis [2]. *Bax* - **Bax** is a pro-apoptotic member of the Bcl-2 family, meaning it promotes cell death rather than preventing it [3]. - It forms pores in the mitochondrial membrane, leading to the release of **cytochrome c** and activation of caspases [4]. *Bcl-xL* - **Bcl-xL** is another anti-apoptotic protein belonging to the Bcl-2 family, sharing functional similarities with Bcl-2 [3]. - While it has anti-apoptotic activity, it was discovered later than Bcl-2 and is not considered the original prototype. *Mcl-1* - **Mcl-1** (Myeloid cell leukemia sequence 1) is an anti-apoptotic protein that is also a member of the Bcl-2 family [3]. - It plays a crucial role in the survival of various cell types, including myeloid cells, but it is not the prototype anti-apoptotic gene. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 602-604. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310. [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. 64-65.

Q: 1 to 2 mm haemorrhages in skin are known as:

Petechiae. ***Petechiae*** - **Petechiae** are small, pinpoint (<3 mm) hemorrhages into the skin or mucous membranes. - They arise from the leakage of blood from small capillaries, often due to **platelet disorders** or **capillary fragility**. *Micro bleed* - A **micro bleed** typically refers to a small area of bleeding within the brain, detected by neuroimaging, not a skin hemorrhage. - The term is used in the context of brain imaging findings, often associated with **cerebral amyloid angiopathy** or hypertension. *Purpura* - **Purpura** are larger areas of hemorrhage into the skin, typically ranging from 3 mm to 1 cm. - They are caused by similar mechanisms as petechiae but involve a larger volume of extravasated blood, often coalescing to form visible patches. *None of the options* - This option is incorrect because **Petechiae** accurately describes 1-2 mm hemorrhages in the skin.

Q: Which of the following is considered a hypercoagulable factor?

Factor V Leiden. ***Factor V Leiden*** - Factor V Leiden is a **mutation** of the Factor V gene, leading to a hypercoagulable state due to **increased resistance** to activated protein C [1]. - This condition substantially raises the risk of **venous thromboembolism**, making it a critical factor in thrombotic events [1]. *Protein S* - Protein S functions as a **cofactor** for activated protein C, promoting inactivation of coagulation factors and thus **decreasing** clot formation. - Deficiency in Protein S can lead to thrombosis, but it is not inherently a **hypercoagulable factor**. *Protein C* - Protein C is activated by the thrombin-thrombomodulin complex, which helps to **regulate coagulation** and **prevent clotting**. - It is protective against thrombosis, and its deficiency can predispose to clot formation, but it does not act as a hypercoagulable factor itself. *Antithrombin III* - Antithrombin III is a **natural anticoagulant** that inhibits thrombin and other proteases of the coagulation cascade, thus preventing excessive clotting. - Its deficiency also leads to hypercoagulability, but it is not classified as a hypercoagulable factor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 133-134.

Q: Blebs are associated with which type of cell injury?

Both. ***Correct: Both*** - Blebs (surface membrane protrusions) are associated with **both reversible and irreversible cell injury** - In **reversible injury**: cellular swelling causes cytoskeletal disruption leading to bleb formation; these blebs can resolve if the injurious stimulus is removed - In **irreversible injury**: more extensive and widespread blebbing occurs during apoptosis and necrosis, associated with cell death pathways - The key difference is in the **extent and reversibility**, not the presence or absence of blebs *Incorrect: Reversible* - While blebs do occur in reversible injury, this option is incomplete as it excludes their occurrence in irreversible injury - Blebs are seen in both types of cellular injury, making "reversible" alone an inadequate answer *Incorrect: Irreversible* - While blebs are prominent in irreversible injury (apoptosis and necrosis), they also occur in reversible injury - Standard pathology texts (Robbins) describe bleb formation as a feature of cellular swelling in reversible injury - This option is incomplete as it excludes reversible injury *Incorrect: None of the options* - This is incorrect because blebs are definitively associated with cell injury (both reversible and irreversible types) - Bleb formation is a well-recognized morphological change in cellular pathology

Q: Which of the following is an example of coagulative necrosis?

Acute tubular necrosis. ***Acute tubular necrosis*** - It is characterized by **coagulative necrosis** in the renal tubules due to ischemia or toxic injury . - This type of necrosis leads to **cellular swelling**, loss of cellular architecture, but maintains the basic outline of the tissue . *Malignant hypertension* - This condition leads to **fibrinoid necrosis** in the blood vessels rather than coagulative necrosis. - Characterized by severe hypertension causing vascular damage and organ dysfunction but does not exemplify coagulative necrosis. *Acute pancreatitis* - Associated with **fat necrosis** due to the action of pancreatic enzymes on adipose tissue. - Does not demonstrate coagulative necrosis since the process involves the dissolution of fat rather than cell structure preservation. *Stroke* - Typically results in **liquefactive necrosis**, especially in the brain, rather than coagulative necrosis. - In stroke cases, the brain tissue becomes soft and liquid-like due to necrosis, not preserving tissue architecture as seen in coagulative necrosis. **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. 51-55.

Q: What is the earliest detectable cellular change following injury?

Diminished ATP. ***Mitochondrial dysfunction*** [1] - Mitochondrial dysfunction is often the **first metabolic change** following cellular injury, impacting ATP production [1]. - Since mitochondria are crucial for energy homeostasis, dysfunction can lead to severe cellular effects and initiate the injury cascade [1]. *Diminished ATP* [1] - While diminished ATP is a consequence of injury, it is not the **initial sign**; it results from mitochondrial dysfunction [1]. - ATP depletion typically occurs **after** mitochondrial impairment has begun, indicating further progression of injury [1]. *Membrane damage* [1] - Membrane integrity can be compromised due to **various insults**, but this happens **after** mitochondrial dysfunction when the cell's economy fails [1]. - Early injury signs primarily involve **functional deficits** rather than structural changes like membrane damage [1]. *Release of lysosomal enzymes* - Release of lysosomal enzymes indicates **cell death** or severe cellular injury, which occurs later in the injury process. - It is not a primary indicator, but rather a response to **critical conditions** post-injury. **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. 49-62.

Q: What is the characteristic feature of thermal injury in tissues?

Coagulation necrosis of tissue proteins. ***Coagulation necrosis of tissue proteins*** - **Thermal injury** causes cell proteins to **denature** and coagulate, leading to cell death and the formation of a solid, opaque mass. - This process is characteristic of **coagulation necrosis**, where the basic tissue architecture is preserved for a period due to enzyme inactivation. *Irregular margins due to thermal damage* - While thermal damage can result in irregular margins, this is a **gross morphological feature** rather than the fundamental cellular and biochemical characteristic of thermal injury. - **Coagulation necrosis** is the underlying histological change that explains the tissue's appearance. *Ruptured blood vessels or clotted blood* - **Ruptured blood vessels** and **clotted blood** can occur with thermal injury, particularly in severe burns, but these are secondary effects or complications, not the primary "characteristic feature" of the tissue injury itself. - The fundamental characteristic is the **denaturation** of cellular proteins. *Smooth tissue margins due to healing* - **Smooth tissue margins** are typically associated with the **healing process** (e.g., re-epithelialization, scar formation) much later in the course after the initial thermal injury. - This option describes a **late-stage reparative process**, not the immediate characteristic feature of acute thermal tissue damage.

Question 1

A patient with heart failure presents with worsening peripheral edema. Which of the following mechanisms contributes most directly to this finding?

Accepted Answer

Increased capillary hydrostatic pressure

Answer

Lymphatic obstruction

Answer

Decreased plasma oncotic pressure

Answer

Increased vascular permeability

Question 2

Which of the following is considered the prototype anti-apoptotic gene?

Accepted Answer

Bcl-2

Answer

Bcl-xL

Answer

Bax

Answer

Mcl-1

Question 3

1 to 2 mm haemorrhages in skin are known as:

Accepted Answer

Petechiae

Answer

Micro bleed

Answer

Purpura

Answer

None of the options

Question 4

Which of the following is considered a hypercoagulable factor?

Accepted Answer

Factor V Leiden

Answer

Protein C

Answer

Protein S

Answer

Antithrombin III

Question 5

Blebs are associated with which type of cell injury?

Accepted Answer

Both

Answer

Reversible

Answer

Irreversible

Answer

None of the options

Question 6

Which of the following is an example of coagulative necrosis?

Accepted Answer

Acute tubular necrosis

Answer

Stroke

Answer

Malignant hypertension

Answer

Acute pancreatitis

Question 7

What is the earliest detectable cellular change following injury?

Accepted Answer

Diminished ATP

Answer

Membrane damage

Answer

Release of lysosomal enzymes

Answer

Mitochondrial dysfunction

Question 8

What is the characteristic feature of thermal injury in tissues?

Accepted Answer

Coagulation necrosis of tissue proteins

Answer

Ruptured blood vessels or clotted blood

Answer

Irregular margins due to thermal damage

Answer

Smooth tissue margins due to healing

Question 9

Which of the following conditions is the best example of both physiological hyperplasia and hypertrophy?

Accepted Answer

Uterus during pregnancy

Answer

None of the options

Answer

Skeletal muscle in athletes

Answer

Breast tissue at puberty

Question 10

Dystrophic calcification is associated with which of the following conditions?

Accepted Answer

Atheromatous plaques and other conditions.

Answer

Milk alkali syndrome

Answer

Hyperparathyroidism

Answer

Vitamin A intoxication

General Pathology — MCQs

General Pathology — MCQs

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