Inflammation and Repair — MCQs

Inflammation and Repair Indian Medical PG Practice Questions and MCQs

Question 331: Trauma to the breast causes which type of necrosis?

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

Explanation: **Explanation:** **Fat necrosis** is the correct answer because it is a specialized form of cell death occurring in tissues with high lipid content, such as the breast, omentum, and pancreas [1]. When trauma occurs to the breast, adipocytes (fat cells) rupture, releasing neutral fats (triglycerides). These fats are broken down by lipases into free fatty acids, which then combine with calcium ions in a process called **saponification** [1]. This results in the characteristic "chalky white" macroscopic appearance [1]. **Analysis of Incorrect Options:** * **Coagulative Necrosis:** This is the most common pattern of necrosis, typically caused by ischemia/infarction in solid organs (e.g., heart, kidney, spleen), except the brain. The cell architecture is preserved for a few days. * **Liquefactive Necrosis:** Characterized by the digestion of dead cells into a liquid viscous mass. It is seen in focal bacterial/fungal infections (abscesses) and **hypoxic death of cells within the Central Nervous System (brain).** * **Caseous Necrosis:** A "cheese-like" friable appearance characteristic of **Tuberculosis** infection [1]. It is a combination of coagulative and liquefactive necrosis where the tissue architecture is completely obliterated. **High-Yield Pearls for NEET-PG:** * **Clinical Mimicry:** Breast fat necrosis is high-yield because it can present as a painless, hard mass with skin retraction, clinically **mimicking breast carcinoma**. * **Radiology:** On mammography, it may show "egg-shell" calcifications. * **Enzymatic vs. Traumatic:** Fat necrosis in the **pancreas** is "enzymatic" (due to activated lipases), whereas in the **breast**, it is typically "traumatic." **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, p. 55.

Question 332: A full-thickness wound that is not sutured heals by what process?

A. Primary healing
B. Secondary healing (Correct Answer)
C. Delayed primary healing
D. Reepithelization

Explanation: ### Explanation **Correct Answer: B. Secondary healing** **Why it is correct:** Healing by **secondary intention (secondary healing)** occurs when a wound has extensive tissue loss, irregular edges, or is left open (not sutured) [1], [2]. Because the wound edges are not approximated, the body must fill the defect from the bottom up. This process is characterized by: 1. **More intense inflammation:** Due to a larger amount of necrotic debris and exudate [2]. 2. **Abundant granulation tissue:** To fill the larger gap [2]. 3. **Wound Contraction:** Mediated by **myofibroblasts**, which significantly reduces the wound size but can lead to scarring and deformities [2], [3]. **Why the other options are incorrect:** * **A. Primary healing:** Also known as healing by first intention, this occurs in clean, uninfected surgical incisions where the edges are approximated by sutures, staples, or tape [1]. It involves minimal tissue loss and minimal scarring. * **C. Delayed primary healing:** Also called tertiary intention, this occurs when a wound is initially left open (due to contamination or edema) and is surgically closed later after the infection has cleared. * **D. Reepithelization:** This is a component of both primary and secondary healing where epithelial cells migrate across the wound surface. While it occurs in a full-thickness wound, it is only one part of the complex "secondary healing" process, which also involves collagen deposition and contraction [2]. **High-Yield NEET-PG Pearls:** * **Myofibroblasts** are the key cells responsible for **wound contraction** in secondary healing; they appear around day 3–5 [3]. * **Type III Collagen** is synthesized first during repair, which is later replaced by **Type I Collagen** (stronger) during the remodeling phase. * The maximum strength a wound can achieve is approximately **70-80%** of unwounded skin at 3 months [2], [4]. **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. 106-107. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 119. [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. 105-106. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 119-121.

Question 333: Delayed wound healing is seen in all of the following conditions EXCEPT?

A. Malignancy
B. Hypertension (Correct Answer)
C. Diabetes
D. Infection

Explanation: Wound healing is a complex process involving inflammation, proliferation, and remodeling. Factors affecting this process are categorized into **local factors** (e.g., infection, foreign bodies) and **systemic factors** (e.g., nutrition, metabolic status) [1]. **Why Hypertension is the Correct Answer:** Hypertension, in isolation, is **not** a recognized cause of delayed wound healing. While chronic hypertension can lead to atherosclerosis (which impairs perfusion), the physiological state of high blood pressure itself does not interfere with the cellular or molecular mechanisms of tissue repair. In contrast, the other options directly disrupt the healing cascade. **Analysis of Incorrect Options:** * **Infection:** This is the **most common** local cause of delayed wound healing. It prolongs the inflammatory phase and causes persistent tissue injury through the release of toxins and degradative enzymes [1]. * **Diabetes Mellitus:** This is a major systemic cause. It impairs healing via multiple mechanisms: microangiopathy (reduced perfusion), neuropathy [2], and impaired leukocyte function (chemotaxis and phagocytosis) [1]. * **Malignancy:** Cancer leads to a state of "cachexia" and protein-energy malnutrition. Since collagen synthesis requires adequate amino acids and vitamins, the catabolic state of malignancy significantly retards repair [1]. **NEET-PG High-Yield Pearls:** * **Vitamin C Deficiency (Scurvy):** Leads to defective collagen synthesis because it is a cofactor for the hydroxylation of proline and lysine [1]. * **Zinc Deficiency:** Impairs DNA synthesis and cell division, crucial for epithelialization. * **Glucocorticoids:** Delay healing by inhibiting TGF-̢ and decreasing collagen synthesis (often used to prevent keloids) [1]. * **Most important systemic factor:** Nutrition (specifically Protein deficiency) [1]. * **Most important local factor:** Infection [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 116-117, 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. 110-111.

Question 334: Delayed wound healing is seen in all of the following conditions except:

A. Malignancy
B. Hypertension (Correct Answer)
C. Diabetes
D. Infection

Explanation: **Explanation:** Wound healing is a complex process involving inflammation, proliferation, and remodeling. Factors affecting this process are categorized into **local factors** (e.g., infection, foreign bodies) and **systemic factors** (e.g., nutrition, metabolic status) [1]. **Why Hypertension is the Correct Answer:** Hypertension, in isolation, is **not** a recognized cause of delayed wound healing. While chronic hypertension can lead to atherosclerosis (which impairs perfusion), it does not directly interfere with the cellular or molecular mechanisms of tissue repair. In the context of NEET-PG questions, systemic diseases like Diabetes and Malignancy are classic causes of delay, whereas Hypertension is typically the "distractor." **Analysis of Incorrect Options:** * **Diabetes (C):** This is the most common systemic cause of delayed healing [1]. It causes impaired microcirculation, decreased collagen synthesis, and impaired neutrophil function (chemotaxis and phagocytosis) [2]. * **Infection (D):** This is the most important **local** cause of delayed healing. Persistent inflammation leads to increased tissue injury and prevents the transition to the proliferative phase [1]. * **Malignancy (A):** Cancer causes a state of "systemic frailty" and protein-energy malnutrition. Additionally, treatments like chemotherapy and radiotherapy suppress bone marrow and inhibit fibroblast proliferation, significantly delaying repair [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Vitamin C Deficiency (Scurvy):** Leads to defective collagen synthesis (proline/lysine hydroxylation), causing wound dehiscence [1]. * **Zinc Deficiency:** Impairs epithelialization and fibroblast proliferation (Zinc is a cofactor for DNA polymerase). * **Glucocorticoids:** Delay healing by inhibiting TGF-β and decreasing collagen synthesis (leads to weak scars) [1]. * **Most important factor in wound healing:** Adequate blood supply and nutrition [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 116-117. [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. 110-111. [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. 88-89.

Question 335: A 9-year-old boy is admitted with acute abdominal pain localized in the right iliac fossa. He is pyrexial with localized peritonism in the RIF. Which type of cell is primarily involved in the inflammatory response causing these signs?

A. Lymphocytes
B. Neutrophils (Correct Answer)
C. Macrophages
D. Monocytes

Explanation: **Explanation:** The clinical presentation of acute abdominal pain in the right iliac fossa (RIF), fever (pyrexia), and localized peritonism in a child is a classic description of **Acute Appendicitis**. **1. Why Neutrophils are correct:** Acute appendicitis is a prototype of **Acute Inflammation** [3]. The hallmark of acute inflammation is the recruitment of **Neutrophils** (Polymorphonuclear leukocytes) to the site of injury [1]. These cells are the first responders, migrating from the blood into the tissues within the first 6–24 hours [2]. They are responsible for the clinical signs of "acute" illness through the release of lysosomal enzymes and reactive oxygen species. In pathology, the definitive diagnosis of acute appendicitis requires the histological presence of neutrophils infiltrating the *muscularis propria* [3]. **2. Why other options are incorrect:** * **Lymphocytes (A):** These are the predominant cells in **Chronic Inflammation** and viral infections [1]. They represent an adaptive immune response rather than the immediate innate response seen in acute appendicitis. * **Macrophages (C) & Monocytes (D):** Monocytes circulate in the blood and mature into macrophages in tissue. While they appear in the later stages of acute inflammation (after 48 hours), they are the dominant cells in **Chronic Inflammation** and granulomatous diseases [3]. **Clinical Pearls for NEET-PG:** * **Hallmark of Acute Inflammation:** Neutrophilic infiltration [1]. * **Hallmark of Chronic Inflammation:** Mononuclear infiltration (Lymphocytes, Plasma cells, and Macrophages). * **Sequence of Cell Arrival:** Neutrophils (6–24 hours) → Monocytes/Macrophages (24–48 hours) [3]. * **Exception:** *Pseudomonas* infections show prolonged neutrophil recruitment, while viral infections may show early lymphocyte recruitment. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 580-581. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89. [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. 192-193.

Question 336: Which cells secrete IL-1 and TNF-alpha during inflammation?

A. Plasma cells
B. Lymphocytes
C. Activated macrophages (Correct Answer)
D. Platelets

Explanation: **Explanation:** **Correct Answer: C. Activated macrophages** The primary source of the major pro-inflammatory cytokines, **Interleukin-1 (IL-1)** and **Tumor Necrosis Factor-alpha (TNF-̑)**, is activated macrophages [1]. These cytokines are released in response to bacterial products (like LPS), immune complexes, or physical injury. They act as "master regulators" of inflammation by inducing endothelial activation, stimulating the synthesis of acute-phase proteins in the liver, and triggering systemic effects like fever (by acting on the hypothalamus). **Analysis of Incorrect Options:** * **A. Plasma cells:** These are terminally differentiated B-cells primarily responsible for the secretion of **antibodies (immunoglobulins)**, not pro-inflammatory cytokines. * **B. Lymphocytes:** While T-lymphocytes can secrete TNF, their primary products are interleukins like IL-2, IL-4, and IFN-̑. Macrophages remain the most potent and prolific source of IL-1 and TNF-̑ in the acute inflammatory milieu [1]. * **D. Platelets:** Platelets primarily release growth factors (like **PDGF** and **TGF-̒**) and vasoactive amines (serotonin) from their granules to assist in clotting and wound healing. **High-Yield NEET-PG Pearls:** * **Fever Induction:** IL-1 and TNF-̑ induce fever by increasing **PGE2** synthesis in the hypothalamus. * **Cachexia:** TNF-̑ is also known as **"Cachectin"** because it promotes weight loss and anorexia by suppressing appetite and mobilizing fat stores during chronic inflammation or malignancy. * **Septic Shock:** High concentrations of TNF-̑ are the primary mediators of the systemic hypotension and metabolic disturbances seen in septic shock. * **Inhibitors:** Drugs like **Etanercept** and **Infliximab** are TNF-antagonists used in treating rheumatoid arthritis and IBD. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 105-106.

Question 337: Delayed prolonged increase in vascular permeability in inflammation is due to?

A. Interleukin 1 mediated endothelial retraction (Correct Answer)
B. Increased transcytosis
C. Leakage from newly formed blood vessels
D. Release of histamine causing endothelial contraction

Explanation: ### Explanation Increased vascular permeability is the hallmark of acute inflammation, leading to the formation of exudate. The timing and mechanism of this leakage vary: **1. Why Option A is Correct:** **Endothelial Retraction** is a mechanism where endothelial cells undergo structural reorganization of the cytoskeleton, causing them to pull apart [1]. This process is mediated by cytokines like **Interleukin-1 (IL-1)** and **TNF**. Unlike the immediate response to histamine, this mechanism is **delayed** (taking 4–6 hours to develop) and **prolonged** (lasting 24 hours or more) [1]. **2. Why the Other Options are Incorrect:** * **Option B (Increased Transcytosis):** This involves the movement of fluids and proteins through the cell via the vesiculovacuolar organelle. While it occurs in inflammation (stimulated by VEGF), it is not the primary cause of the "delayed prolonged" pattern. * **Option C (Leakage from New Vessels):** Angiogenesis occurs during the **repair** phase. New vessel sprouts are "leaky" because they have immature endothelial junctions, but this is a feature of chronic inflammation/granulation tissue, not the delayed phase of acute inflammation. * **Option D (Histamine/Endothelial Contraction):** This is the most common mechanism of leakage [1]. However, it is an **immediate transient response**, occurring rapidly (within minutes) and lasting only 15–30 minutes [1]. --- ### High-Yield NEET-PG Pearls * **Immediate Transient Response:** Mediated by Histamine, Bradykinin, and Leukotrienes [2]. Affects only **venules** [1]. * **Delayed Prolonged Leakage:** Mediated by IL-1 and TNF (via retraction) [2] or seen in **thermal/radiation injuries** (via direct cell injury) [1]. * **Immediate Sustained Response:** Seen in severe injuries (e.g., major burns) where there is **direct endothelial cell necrosis**. It affects all levels of microvasculature (arterioles, capillaries, and venules). * **Most common mechanism of leakage:** Endothelial cell contraction (Immediate transient). **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. 186-188. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 101.

Question 338: All are major cytokines in chronic inflammation except?

A. IL-6 (Correct Answer)
B. IL-12
C. IFN-y
D. IL-17

Explanation: **Explanation:** The hallmark of **chronic inflammation** is a persistent immune response dominated by macrophages and T-lymphocytes [2]. The cytokines involved are primarily those that drive lymphocyte activation and macrophage recruitment. **Why IL-6 is the correct answer:** While **IL-6** is a potent inflammatory mediator, it is classically categorized as a **major cytokine of acute inflammation** (alongside TNF and IL-1) [3]. Its primary roles include inducing the systemic "acute phase response" (fever and synthesis of C-reactive protein by the liver) and promoting the transition from neutrophil to monocyte recruitment. Although it can be present in chronic states, it is not considered a primary driver of the chronic inflammatory cell infiltrate compared to the other options. **Analysis of Incorrect Options:** * **IFN-̲ (Interferon-gamma):** The "signature" cytokine of chronic inflammation. Produced by Th1 cells, it is the most potent activator of macrophages (classical pathway), leading to tissue destruction and granuloma formation [4]. * **IL-12:** Produced by macrophages and dendritic cells, it is the critical cytokine that triggers the differentiation of T-cells into **Th1 cells**, which then secrete IFN-̲. * **IL-17:** Produced by **Th17 cells**, it is essential for recruiting neutrophils and monocytes to the site of chronic inflammation and is implicated in many chronic autoimmune diseases (e.g., Psoriasis, Rheumatoid Arthritis) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Inflammation Cytokines:** TNF, IL-1, IL-6, and Chemokines (e.g., IL-8) [3]. * **Chronic Inflammation Cytokines:** IFN-̲, IL-12, IL-17, and IL-4/IL-13 (for alternative macrophage activation) [4]. * **Granuloma Formation:** Driven by the **TNF-̱ and IFN-̲** axis [2]. Anti-TNF therapy can cause the breakdown of old TB granulomas, leading to reactivation. * **IL-6 Clinical Link:** Tocilizumab is an IL-6 receptor antagonist used in Rheumatoid Arthritis and severe COVID-19. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 218. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 109-110. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 97-99. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 105-106.

Question 339: Which of the following historical figures is credited with adding the fifth cardinal sign of inflammation, loss of function (functio laesa)?

A. Rudolf Virchow (Correct Answer)
B. Elie Metchinkoff
C. Louis Pasteur
D. George Bernard

Explanation: Explanation: Inflammation is a complex biological response to harmful stimuli. [1] Historically, the description of inflammation evolved through the contributions of several key figures. **1. Why Rudolf Virchow is correct:** The first four cardinal signs of inflammation—**Rubor** (redness), **Tumor** (swelling), **Calor** (heat), and **Dolor** (pain)—were described by **Cornelius Celsus** in the 1st century AD. [1] It was **Rudolf Virchow**, the father of modern pathology, who later added the fifth cardinal sign: **Functio laesa** (loss of function). This sign reflects the physiological consequence of the other four signs, where tissue damage or pain prevents the normal functioning of the affected organ or limb. **2. Analysis of Incorrect Options:** * **Elie Metchnikoff:** A Nobel laureate known for discovering **phagocytosis**. He shifted the focus of inflammation research from vascular changes to cellular responses. * **Louis Pasteur:** Primarily known for the **Germ Theory of Disease** and vaccinations; he did not contribute to the cardinal signs of inflammation. * **George Bernard:** Likely a distractor (Claude Bernard was a famous physiologist known for the concept of *homeostasis*, but not for the signs of inflammation). **NEET-PG High-Yield Pearls:** * **Celsus:** Described the first 4 signs (Rubor, Tumor, Calor, Dolor). [1] * **Virchow:** Added the 5th sign (Functio laesa). * **John Hunter:** First to note that inflammation is not a disease but a non-specific response that has a protective effect on the host. * **Julius Cohnheim:** First to use a microscope to observe inflammation in living tissue (frog's mesentery), describing the vascular changes and leucocyte migration. **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. 183-186.

Question 340: Which of the following is NOT a positive acute-phase reactant?

A. Serum Amyloid A protein
B. Transthyretin (Correct Answer)
C. Fibrinogen
D. Hepcidin

Explanation: **Explanation:** Acute-phase reactants (APRs) are proteins whose plasma concentrations increase or decrease by at least 25% in response to inflammation, primarily driven by cytokines like **IL-6, IL-1, and TNF-α** [4]. **1. Why Transthyretin is the correct answer:** Transthyretin (formerly known as prealbumin) is a **negative acute-phase reactant**. During inflammation, the liver downregulates the synthesis of certain proteins to conserve amino acids for the production of positive APRs. Other important negative APRs include **Albumin** and **Transferrin** [2]. **2. Analysis of incorrect options (Positive APRs):** * **Serum Amyloid A (SAA):** A major positive APR. Prolonged elevation of SAA in chronic inflammation can lead to Secondary (AA) Amyloidosis [3]. * **Fibrinogen:** Increases during inflammation, causing erythrocytes to sediment faster. This is the primary reason for an **elevated Erythrocyte Sedimentation Rate (ESR)** during infection. * **Hepcidin:** An iron-regulatory hormone that increases during inflammation [1]. It sequesters iron within macrophages, leading to **Anemia of Chronic Disease** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **C-Reactive Protein (CRP):** The most commonly measured positive APR; it acts as an opsonin for phagocytosis. * **Procalcitonin:** A specific marker used to distinguish bacterial infections from viral infections or non-infectious inflammation. * **Ferritin:** A positive APR that stores iron; its elevation during inflammation can mask an underlying iron deficiency. * **Ceruloplasmin:** A positive APR that carries copper and acts as an antioxidant. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 660-662. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 657-658. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 267-268. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 110-111.

Practice by Chapter

Acute Inflammation: Vascular Events

Practice Questions

Acute Inflammation: Cellular Events

Practice Questions

Chemical Mediators of Inflammation

Practice Questions

Chronic Inflammation

Practice Questions

Granulomatous Inflammation

Practice Questions

Systemic Effects of Inflammation

Practice Questions

Wound Healing

Practice Questions

Tissue Regeneration

Practice Questions

Fibrosis and Repair

Practice Questions

Resolution of Inflammation

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