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: 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: 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: Vitamin A deficiency leads to metaplasia of which type of epithelium?

Columnar epithelium. ***Squamous epithelium*** - Vitamin A deficiency leads to a condition known as **xerophthalmia**, which involves the metaplasia of conjunctival epithelium from columnar to **squamous** type [1]. - It is crucial for maintaining the integrity of **epithelial tissues**, particularly in the respiratory and gastrointestinal tracts, leading to squamous metaplasia [1]. *None* - This option fails to recognize that **metaplasia** occurs specifically in response to deficiency of vitamin A. - The implication that no changes occur is incorrect, as significant alterations to epithelial types are noted in deficiency states [1]. *Columnar epithelium* - While columnar epithelium can undergo metaplasia, it typically becomes squamous in vitamin A deficiency, not remaining solely columnar [2]. - Conditions like intestinal metaplasia occur due to other pathways, such as chronic irritation, not directly linked to vitamin A deficiency. *Both* - This option suggests metaplasia in both epithelium types, which is misleading as vitamin A deficiency primarily affects **squamous** epithelium, not columnar directly [1]. - The typical response is a loss of **columnar** cells and their replacement with **squamous** cells, rather than dual metaplasia [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 445-446. [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. 49.

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 primary cause of hydropic change in cells?

Accumulation of water intracellularly. ***Accumulation of water intracellularly*** - Hydropic change, also known as cellular swelling, is primarily due to the **accumulation of water** within the cells caused by various pathological insults [1]. - This process is often seen in conditions such as **reversible cell injury** where the normal ion gradients are disturbed, leading to increased intracellular water [1]. *Glycogen accumulation intracellularly* - Glycogen accumulation is seen in conditions like **diabetes** or **glycogen storage diseases**, which does not lead to hydropic change. - It is characterized by the presence of **cytoplasmic granules** rather than water accumulation. *Fat accumulation intracellularly* - While fat accumulation indicates **lipidosis**, it is distinct from water accumulation and presents as **fat vacuoles** within the cell. - Commonly associated with conditions like **alcoholic liver disease**, not hydropic change. *Lysozyme degeneration* - Lysozyme degeneration relates to the breakdown of cellular components rather than an accumulation of water. - This process can lead to **cellular damage and necrosis**, but is not a direct cause of hydropic change. **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. 51-53.

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

Blebs are associated with which type of cell injury?

Accepted Answer

Both

Answer

Reversible

Answer

Irreversible

Answer

None of the options

Question 5

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 6

Vitamin A deficiency leads to metaplasia of which type of epithelium?

Accepted Answer

Columnar epithelium

Answer

None of the options

Answer

Cuboidal epithelium

Answer

Squamous epithelium

Question 7

Which of the following is an example of coagulative necrosis?

Accepted Answer

Acute tubular necrosis

Answer

Stroke

Answer

Malignant hypertension

Answer

Acute pancreatitis

Question 8

What is the primary cause of hydropic change in cells?

Accepted Answer

Accumulation of water intracellularly

Answer

Fat accumulation intracellularly

Answer

Glycogen accumulation intracellularly

Answer

Lysosomal degeneration

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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