General Pathology — MCQs
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Which of the following is a useful marker to detect autophagy in cells?
What is the most potent stimulator of naive T-cells?
A gastric biopsy is performed on a patient with suspected graft-versus-host disease following bone marrow transplantation. The biopsy demonstrates isolated dying epithelial cells in crypts showing fragmented, hyperchromatic nuclei and small discrete blebs containing both cytoplasm and nuclear fragments. What process do these findings demonstrate?
Intracellular calcification begins in which of the following organelles?
Which of the following statements best characterizes natural killer cells?
Amyloid is detected by staining with which of the following, except?
Neutrophilic leucocytosis is seen in all conditions EXCEPT
High risk of malignancy is seen in which of the following conditions?
Which vitamin deficiency is implicated in the metaplasia of respiratory epithelium?
Which of the following diseases is caused by an inflammatory reaction involving neutrophils?
General Pathology Indian Medical PG Practice Questions and MCQs
Question 1211: Which of the following is a useful marker to detect autophagy in cells?
- A. BAK
- B. BAX
- C. LC3 (Correct Answer)
- D. BID
Explanation: **Explanation:** **Autophagy** is a process of "self-eating" where cells sequester cytoplasmic organelles and proteins into double-membrane vesicles called **autophagosomes**, which then fuse with lysosomes for degradation [1]. **Why LC3 is the correct answer:** **LC3 (Microtubule-associated protein 1 Light Chain 3)** is the most widely used marker for autophagy. During the initiation of autophagy, the cytosolic form (LC3-I) is conjugated with phosphatidylethanolamine to form **LC3-II**. This lipidated form (LC3-II) specifically binds to the autophagosomal membrane. Therefore, the presence and accumulation of LC3-II (detected via western blot or immunofluorescence as "puncta") serve as a definitive marker for the formation of autophagosomes. **Why the other options are incorrect:** * **BAK and BAX (Options A & B):** These are **pro-apoptotic** members of the Bcl-2 family. They act as "molecular sensors" that form pores in the outer mitochondrial membrane, leading to the release of Cytochrome C and the initiation of the intrinsic pathway of apoptosis. * **BID (Option D):** This is a "BH3-only" pro-apoptotic protein. It acts as a link between the extrinsic and intrinsic pathways; when cleaved by Caspase-8 into **t-BID**, it activates BAX/BAK. **High-Yield NEET-PG Pearls:** * **Atg genes:** Autophagy-related genes (Atg) regulate the various stages of this process [1]. * **p62 (Sequestosome 1):** Another marker for autophagy; it binds to cargo and LC3. Unlike LC3, p62 levels **decrease** when autophagy is complete (as it is degraded). * **Clinical Link:** Autophagy is implicated in neurodegenerative diseases (Alzheimer’s), cancer (both as a suppressor and a survival mechanism), and defense against intracellular pathogens (Mycobacteria). **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. 71-73.
Question 1212: What is the most potent stimulator of naive T-cells?
- A. Mature dendritic cells (Correct Answer)
- B. Follicular dendritic cells
- C. Macrophages
- D. B-cells
Explanation: **Explanation:** The activation of **naive T-cells** (T-cells that have not yet encountered an antigen) requires two signals: the recognition of an antigen presented on an MHC molecule and a potent co-stimulatory signal (e.g., B7-CD28 interaction) [1], [2]. **Mature Dendritic Cells (DCs)** are the most potent stimulators because they are the only professional antigen-presenting cells (APCs) that constitutively express high levels of both MHC class II and co-stimulatory molecules [1]. While immature DCs are specialized for antigen capture, "mature" DCs migrate to regional lymph nodes where they specialize in antigen presentation, making them uniquely capable of activating "virgin" or naive T-cells [1]. **Why other options are incorrect:** * **Follicular Dendritic Cells (FDCs):** Despite the name, these are not derived from bone marrow and do not express MHC II. They trap antigen-antibody complexes on their surface to present to **B-cells** in germinal centers, not naive T-cells. * **Macrophages:** These are excellent at phagocytosis but are generally poor at activating naive T-cells. They primarily present antigens to **already sensitized** (effector) T-cells to initiate cell-mediated immunity at the site of infection [1]. * **B-cells:** These present antigens to **Helper T-cells** (CD4+) to receive signals for antibody production (humoral immunity), but they are not the primary initiators of a primary immune response. **High-Yield Clinical Pearls for NEET-PG:** * **Langerhans Cells:** These are immature dendritic cells found in the epidermis. * **The "Professional" Trio:** Dendritic cells, Macrophages, and B-cells are the three professional APCs. * **Cross-presentation:** Dendritic cells have the unique ability to present exogenous antigens via MHC Class I to CD8+ T-cells (vital for viral defense) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 204-206. [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. 157-158.
Question 1213: A gastric biopsy is performed on a patient with suspected graft-versus-host disease following bone marrow transplantation. The biopsy demonstrates isolated dying epithelial cells in crypts showing fragmented, hyperchromatic nuclei and small discrete blebs containing both cytoplasm and nuclear fragments. What process do these findings demonstrate?
- A. Apoptosis (Correct Answer)
- B. Caseous necrosis
- C. Coagulative necrosis
- D. Gangrenous necrosis
Explanation: **Explanation:** The clinical scenario and histopathological findings described are classic for **Apoptosis**. [1] **1. Why Apoptosis is Correct:** Apoptosis is "programmed cell death" characterized by specific morphological changes. [2] The description of **isolated dying cells** (rather than large sheets of tissue), **fragmented hyperchromatic nuclei** (karyorrhexis), and **small discrete blebs** (apoptotic bodies) [3] containing cytoplasm and nuclear fragments are pathognomonic features. In the context of Graft-Versus-Host Disease (GVHD), cytotoxic T-cells induce apoptosis in the host's epithelial cells (especially in the skin, liver, and GI tract). [2] The presence of "apoptotic bodies" in the base of intestinal crypts is a hallmark diagnostic feature of GI-GVHD. **2. Why Incorrect Options are Wrong:** * **Caseous Necrosis:** Characterized by a "cheese-like" friable appearance, typically seen in Tuberculosis. Microscopically, it shows a structureless, eosinophilic granular area surrounded by granulomatous inflammation. * **Coagulative Necrosis:** Usually results from ischemia (infarction). It is characterized by the preservation of the basic cell outline ("tombstone appearance") for several days due to the denaturation of structural proteins and enzymes. * **Gangrenous Necrosis:** This is not a distinct pattern of cell death but a clinical term. It usually refers to coagulative necrosis (dry gangrene) involving multiple tissue layers, often with superimposed bacterial infection (wet gangrene). **NEET-PG High-Yield Pearls:** * **Morphological Hallmark:** The most characteristic feature of apoptosis is **chromatin condensation** (pyknosis) and fragmentation. * **Key Difference:** Unlike necrosis, apoptosis does **not** elicit an inflammatory response because the cell membrane remains intact until the apoptotic bodies are phagocytosed. [3] * **Biochemical Marker:** Caspases are the executioner enzymes of apoptosis. [4] * **GVHD Target Organs:** Skin (rash), Liver (jaundice), and Gut (diarrhea). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 740-741. [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, pp. 63-64. [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. 67-69. [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.
Question 1214: Intracellular calcification begins in which of the following organelles?
- A. Mitochondria (Correct Answer)
- B. Golgi body
- C. Lysosomes
- D. Nucleus
Explanation: **Explanation:** Pathologic calcification involves the abnormal deposition of calcium salts in tissues. This process occurs in two phases: **initiation** (nucleation) and **propagation**. **Why Mitochondria is correct:** Intracellular calcification typically begins in the **mitochondria** of dead or dying cells [1]. In the setting of cell injury, there is an influx of calcium into the cytosol and a failure of the ATP-dependent calcium pump [2]. The mitochondria actively sequester this excess calcium. As the concentration rises, calcium ions bind to phospholipids in the inner mitochondrial membrane, forming microcrystals of **hydroxyapatite** [1]. This serves as the "nidus" or starting point for further mineral deposition. **Why the other options are incorrect:** * **Golgi body:** While involved in protein modification and trafficking, the Golgi apparatus does not play a primary role in the sequestration of calcium during cell injury. * **Lysosomes:** These contain hydrolytic enzymes for degradation. While they may contain debris in injured cells, they are not the primary site for the initiation of mineral nucleation. * **Nucleus:** Although chromatin can eventually calcify in advanced stages of cell death (karyolysis/karyorrhexis), the initial biochemical accumulation of calcium salts occurs in the mitochondria due to its metabolic role in ion handling. **High-Yield NEET-PG Pearls:** * **Dystrophic Calcification:** Occurs in **dead/dying tissues** with **normal** serum calcium levels (e.g., Atherosclerosis, Monckeberg’s medial calcific sclerosis, Psammoma bodies). * **Metastatic Calcification:** Occurs in **normal tissues** due to **hypercalcemia** (e.g., Hyperparathyroidism, Vitamin D toxicity). It primarily affects "acid-excreting" organs like the gastric mucosa, kidneys, and lungs. * **Extracellular Calcification:** Begins in **matrix vesicles** (membrane-bound vesicles derived from degenerating cells). **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. 53-55. [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, pp. 57-59.
Question 1215: Which of the following statements best characterizes natural killer cells?
- A. They are a subset of T cells.
- B. They are involved in type III hypersensitivity reactions.
- C. They require prior sensitization in order to kill virally infected cells or tumor cells.
- D. They participate in antibody-dependent cellular cytotoxicity reactions. (Correct Answer)
Explanation: **Explanation:** **Natural Killer (NK) cells** are a distinct lineage of innate lymphoid cells that provide the first line of defense against virally infected cells and tumor cells [1]. **Why Option D is correct:** NK cells express **CD16**, a low-affinity receptor for the Fc portion of IgG. This allows them to bind to target cells already coated with IgG antibodies. Once bound, the NK cell releases perforins and granzymes, leading to the lysis of the target cell. This process is known as **Antibody-Dependent Cellular Cytotoxicity (ADCC)**. **Analysis of Incorrect Options:** * **Option A:** NK cells are **not** a subset of T cells. They lack T-cell receptors (TCR) and CD3 markers [2]. They are "Large Granular Lymphocytes" belonging to the innate immune system. * **Option B:** Type III hypersensitivity involves immune complex deposition (e.g., SLE). NK cells are primarily involved in **Type II hypersensitivity** (via ADCC). * **Option C:** Unlike cytotoxic T cells (CD8+), NK cells do **not** require prior sensitization or MHC restriction [1]. They function based on a balance between "activating" and "inhibitory" receptors (the latter recognize MHC-I on healthy cells) [2]. **High-Yield Facts for NEET-PG:** * **Markers:** CD16 (Fc̳RIII) and **CD56** (NCAM) are the characteristic markers. * **Inhibitory Receptors:** Killer Cell Immunoglobulin-like Receptors (**KIRs**) recognize MHC-I; their absence (the "missing self" hypothesis) triggers NK cell activation [1]. * **Cytokine Activation:** Their activity is significantly enhanced by **IL-2, IL-12, and IFN-̱/̲** [1]. * **Granules:** They contain perforins (create pores) and granzymes (induce apoptosis). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 200-201. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 207-208.
Question 1216: Amyloid is detected by staining with which of the following, except?
- A. Methyl violet
- B. Alcain Blue (Correct Answer)
- C. Congo Red
- D. Thioflavin
Explanation: **Explanation:** Amyloid is a pathological proteinaceous substance deposited between cells in various tissues [1]. Its detection relies on its unique physical structure (non-branching fibrils in a beta-pleated sheet configuration) and its chemical properties [1]. **Why Alcian Blue is the correct answer (the "Except"):** **Alcian Blue** is a stain primarily used to detect **acidic mucopolysaccharides** (mucin) and glycosaminoglycans. It is commonly used in the diagnosis of Barrett’s esophagus or certain connective tissue disorders. It does not have an affinity for amyloid fibrils and is therefore not used for its detection. **Analysis of Incorrect Options (Stains used for Amyloid):** * **Congo Red:** The gold standard. Under ordinary light, amyloid appears pink/red [1]. Under **polarized light**, it exhibits a characteristic **apple-green birefringence** due to the beta-pleated sheet structure [1]. * **Methyl Violet (and Crystal Violet):** These are **metachromatic stains**. Amyloid reacts with these dyes to produce a color shift (e.g., staining reddish-violet against a blue background). * **Thioflavin (T or S):** These are **fluorescent stains**. When viewed under a fluorescence microscope, amyloid fibrils bound to Thioflavin produce a secondary yellow-green fluorescence. This method is highly sensitive but less specific than Congo Red. **High-Yield Clinical Pearls for NEET-PG:** * **Best/Gold Standard Stain:** Congo Red (Apple-green birefringence) [1]. * **Most Sensitive Stain:** Thioflavin T (often used for screening). * **H&E Appearance:** Amyloid appears as an extracellular, amorphous, eosinophilic (pink), hyaline material [1]. * **Electron Microscopy:** Shows 7.5–10 nm wide, linear, non-branching fibrils [1]. * **Iodine Test:** On gross specimens, amyloid turns brown with iodine and blue-violet with the addition of sulfuric acid (resembling starch, hence the name "amyloid") [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 264-269.
Question 1217: Neutrophilic leucocytosis is seen in all conditions EXCEPT
- A. Sepsis
- B. Myocardial infarction
- C. Pyogenic osteomyelitis
- D. Hay fever (Correct Answer)
Explanation: **Explanation:** Neutrophilic leucocytosis (an increase in the absolute neutrophil count) is a hallmark of **acute inflammation** and **bacterial infections** [1]. **Why Hay Fever is the Correct Answer:** Hay fever (Allergic Rhinitis) is a Type I hypersensitivity reaction. In allergic conditions and parasitic infestations, the body characteristically shows **Eosinophilia**, not neutrophilia [1], [3]. Eosinophils are recruited to the site of allergic inflammation by cytokines like IL-5. Therefore, Hay fever is the exception in this list. **Analysis of Incorrect Options:** * **Sepsis:** Severe systemic bacterial infections trigger the release of neutrophils from the bone marrow storage pool (often causing a "left shift" or bandemia) as part of the acute phase response [2]. * **Myocardial Infarction (MI):** This is a classic example of **sterile inflammation**. Tissue necrosis (infarction) triggers an inflammatory cascade where neutrophils are the first cells to infiltrate the necrotic myocardium to clear debris [1], [2]. * **Pyogenic Osteomyelitis:** Being a "pyogenic" (pus-forming) bacterial infection, it strongly stimulates the production and recruitment of neutrophils to the bone [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Leukemoid Reaction:** An extreme neutrophilic leucocytosis (>50,000 cells/µL) seen in severe infections, distinguishable from CML by a **high LAP (Leukocyte Alkaline Phosphatase) score**. * **Steroid Effect:** Corticosteroids cause neutrophilia by decreasing neutrophil adhesion to vessel walls (demargination), but they cause eosinopenia and lymphopenia [2]. * **Eosinophilia Causes (Mnemonic: NAACP):** **N**eoplasia, **A**llergy/Asthma, **A**ddison’s disease, **C**onnective tissue disorders, **P**arasites [1]. **References:** [1] 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, p. 592. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 580-581. [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. 195-196.
Question 1218: High risk of malignancy is seen in which of the following conditions?
- A. Simple hyperplasia with atypia
- B. Simple hyperplasia without atypia
- C. Complex hyperplasia with atypia (Correct Answer)
- D. Complex hyperplasia without atypia
Explanation: **Explanation:** The risk of progression to **Endometrial Adenocarcinoma** is primarily determined by the presence of **cellular atypia** and the complexity of the glandular architecture [1][4]. **1. Why Option C is Correct:** **Complex hyperplasia with atypia** (also known as Endometrial Intraepithelial Neoplasia or EIN) carries the highest risk of malignancy, with approximately **23–48%** of cases progressing to carcinoma if left untreated [2][3]. The combination of structural complexity (crowded glands with little intervening stroma) and cytologic atypia (loss of polarity, prominent nucleoli, and pleomorphism) indicates a significant genetic shift toward malignancy [3]. **2. Why Other Options are Incorrect:** * **Option A (Simple with atypia):** While atypia increases risk, the lack of architectural complexity makes it less risky than the complex form (approx. 8% progression risk). * **Option B (Simple without atypia):** This is the most common form, often resulting from unopposed estrogen. It has the lowest progression risk (approx. 1%). * **Option C (Complex without atypia):** Despite the crowded "back-to-back" glandular appearance, the absence of cytologic atypia keeps the progression risk relatively low (approx. 3–5%) [2]. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification (2014/Revised):** The classification has been simplified into two categories: **Hyperplasia without atypia** and **Atypical hyperplasia/EIN** [1]. * **Key Risk Factor:** Unopposed estrogen (e.g., PCOS, Obesity, Estrogen-only HRT, Granulosa cell tumors) [1][4]. * **Genetic Mutation:** **PTEN** tumor suppressor gene inactivation is frequently seen in both endometrial hyperplasia and Type I endometrial carcinoma [1][4]. * **Management:** Atypical hyperplasia in postmenopausal women is generally treated with total hysterectomy due to the high risk of coexistent or future carcinoma [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1017-1018. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 473-475. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1018-1020. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1016-1017.
Question 1219: Which vitamin deficiency is implicated in the metaplasia of respiratory epithelium?
- A. Vitamin A (Correct Answer)
- B. Vitamin C
- C. Vitamin B
- D. Vitamin E
Explanation: **Explanation:** **1. Why Vitamin A is Correct:** Vitamin A (Retinol) and its derivatives (Retinoic Acid) are essential for the normal differentiation and maintenance of specialized epithelia. In the respiratory tract, Vitamin A ensures that the epithelium remains **pseudostratified ciliated columnar**. When Vitamin A is deficient, the epithelial cells lose their specialized function and undergo **Squamous Metaplasia**, transforming into a keratinizing squamous epithelium [1]. This new epithelium is tougher but lacks the protective cilia and mucus secretion necessary to clear pathogens, leading to increased respiratory infections [1], [2]. This process is mediated through the binding of retinoic acid to nuclear receptors (RARs), which regulate gene expression for epithelial differentiation. **2. Why Other Options are Incorrect:** * **Vitamin C:** Deficiency leads to **Scurvy**, characterized by defective collagen synthesis (impaired hydroxylation of proline and lysine), resulting in capillary fragility and poor wound healing, not epithelial metaplasia. * **Vitamin B:** This group (e.g., B12, Folate) is primarily involved in DNA synthesis and energy metabolism. Deficiency typically leads to megaloblastic anemia or neurological issues. * **Vitamin E:** Acts as a potent antioxidant protecting cell membranes from lipid peroxidation. Deficiency causes hemolytic anemia and posterior column signs, but does not cause metaplasia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Bitot’s Spots & Xerophthalmia:** Other classic signs of Vitamin A deficiency involving squamous metaplasia of the conjunctiva. * **APML (M3 Leukemia):** Treated with All-trans Retinoic Acid (ATRA), highlighting Vitamin A’s role in cellular maturation. * **Metaplasia Reversibility:** Metaplasia is a **reversible** adaptation; if the stress (deficiency) is removed, the epithelium can revert to its original type [1]. However, persistent metaplasia can predispose to neoplasia [1]. **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. 49. [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. 91-92.
Question 1220: Which of the following diseases is caused by an inflammatory reaction involving neutrophils?
- A. Acute respiratory distress syndrome (Correct Answer)
- B. Septic shock
- C. Asthma
- D. Arthritis
Explanation: **Explanation:** The correct answer is **Acute Respiratory Distress Syndrome (ARDS)**. This question tests your knowledge of the specific inflammatory cells involved in various pathological conditions. **1. Why ARDS is correct:** ARDS is a classic example of **acute inflammation** where **neutrophils** play a central role [1]. In the early exudative phase, systemic or local triggers cause massive recruitment of neutrophils into the pulmonary capillaries and alveolar spaces. These neutrophils release reactive oxygen species (ROS), proteases, and cytokines (like IL-8), which damage the alveolar-capillary membrane, leading to non-cardiogenic pulmonary edema and hyaline membrane formation [1]. **2. Why the other options are incorrect:** * **Septic Shock:** While neutrophils are involved in the systemic inflammatory response, the primary pathophysiology of septic shock is mediated by **cytokines** (TNF-α, IL-1) and **macrophages**, leading to systemic vasodilation and multi-organ failure. * **Asthma:** This is a Type I hypersensitivity reaction characterized by chronic airway inflammation where **eosinophils**, mast cells, and IgE are the primary mediators, not neutrophils [2]. * **Arthritis:** While some forms of arthritis (like Gout) involve neutrophils, "Arthritis" as a general term usually refers to chronic inflammatory conditions (like Rheumatoid Arthritis) where **lymphocytes and macrophages** are the dominant cells. **Clinical Pearls for NEET-PG:** * **Neutrophil-mediated diseases:** ARDS, Glomerulonephritis, Acute Transplant Rejection, and Vasculitis [3]. * **Macrophage/Lymphocyte-mediated:** Sarcoidosis, Tuberculosis (Granulomatous inflammation) [2]. * **Eosinophil-mediated:** Bronchial Asthma, Parasitic infections, and Churg-Strauss Syndrome. * **High-yield Cytokine:** **IL-8** is the most potent chemotactic factor for neutrophils in the lungs during ARDS. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 679-681. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 92-93. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519.
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Adaptations of Cellular Growth
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Acute and Chronic Inflammation
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Hemodynamic Disorders
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Genetic Disorders
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Molecular Basis of Disease
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