Histology Practice Questions

Q: Goblet cells are not seen in which of the following locations?

Esophagus. The correct answer is **D. Esophagus**. [1] **1. Why Esophagus is the correct answer:** The esophagus is lined by **non-keratinized stratified squamous epithelium**. This multi-layered epithelium is designed to provide protection against mechanical abrasion during swallowing. It does not naturally contain Goblet cells. The presence of Goblet cells in the esophagus is a pathological finding known as **intestinal metaplasia** (Barrett’s Esophagus), usually resulting from chronic gastroesophageal reflux disease (GERD). **2. Analysis of Incorrect Options:** * **A. Colon:** The large intestine contains a high density of Goblet cells within its simple columnar epithelium to provide lubrication for the passage of solid fecal matter. [1] * **B. Trachea:** The respiratory tract is lined by **pseudostratified ciliated columnar epithelium** (Respiratory Epithelium), which contains numerous Goblet cells that secrete mucus to trap inhaled particles. * **C. Conjunctiva:** The conjunctiva is lined by stratified columnar/cuboidal epithelium that contains Goblet cells. These cells are essential for secreting the mucous layer of the tear film, which keeps the eye moist. **3. NEET-PG High-Yield Pearls:** * **Definition:** Goblet cells are unicellular glands that secrete mucin. * **Staining:** They are best visualized using **PAS (Periodic Acid-Schiff)** or **Alcian Blue** stains. * **Distribution Rule:** They are found in the respiratory tract (except the vocal cords and terminal bronchioles/alveoli) and the gastrointestinal tract (except the esophagus and stomach). * **Clinical Correlation:** The appearance of Goblet cells in the stomach (Intestinal metaplasia) or esophagus (Barrett’s) is a precursor to adenocarcinoma.

Q: Which is the commonest site for secondary metastasis in a case of hypernephroma?

Lungs. **Explanation:** **Hypernephroma**, also known as Renal Cell Carcinoma (RCC), is characterized by its unique tendency for early **hematogenous spread** (venous invasion). **1. Why Lungs are the Correct Answer:** The most common site for distant metastasis in RCC is the **Lungs (50-60%)**. This occurs because the tumor cells characteristically invade the renal vein and the inferior vena cava (IVC). From the IVC, the tumor emboli travel directly to the right side of the heart and are then pumped into the pulmonary circulation, where they lodge in the lung parenchyma. On imaging, these often appear as multiple, well-circumscribed nodules known as **"Cannon-ball metastasis."** **2. Analysis of Incorrect Options:** * **Bones:** This is the second most common site (approx. 30-40%). Metastases are typically **osteolytic** (bone-destroying) and often affect the axial skeleton. * **Adrenal:** While RCC can spread to the ipsilateral adrenal gland via direct extension or venous routes, it is less frequent than pulmonary involvement. * **Brain:** Brain metastasis occurs in only about 5% of cases and usually represents a late-stage manifestation of the disease. **3. High-Yield Clinical Pearls for NEET-PG:** * **Route of Spread:** Unlike most carcinomas (which spread via lymphatics), RCC primarily spreads via the **bloodstream**. * **Classic Triad:** Hematuria (most common), flank pain, and a palpable mass (seen in only 10% of patients). * **Histology:** The **Clear Cell** variant is the most common histological subtype. * **Left-sided Varicocele:** A classic physical finding in males if the tumor obstructs the left renal vein, preventing drainage of the left testicular vein.

Q: Secretory basket cells are located where?

Between secretory cells and the basal lamina. ### Explanation **Concept Overview:** "Secretory basket cells" is a descriptive term for **Myoepithelial cells**. These are specialized contractile cells found in exocrine glands, such as salivary glands, mammary glands, and sweat glands. They possess features of both epithelium (cytokeratin filaments) and smooth muscle (actin and myosin). **Why Option C is Correct:** Myoepithelial cells are strategically located **between the basal plasma membrane of the secretory (acinar) cells and the basal lamina** of the epithelium. When these cells contract, they squeeze the acinus like a "basket," increasing the pressure and facilitating the expulsion of secretory products into the ductal system. **Analysis of Incorrect Options:** * **Option A:** They are not *inside* the acini; they are part of the epithelial layer but remain external to the secretory cells themselves. * **Option B:** While myoepithelial cells can be found surrounding intercalated ducts, their primary and most characteristic "basket-like" morphology is associated with the secretory acini. * **Option D:** Striated ducts and larger excretory ducts generally lack myoepithelial cells, as the primary force for secretion has already been generated at the acinar level. **High-Yield NEET-PG Pearls:** * **Staining:** Myoepithelial cells are best visualized using immunohistochemistry for **S-100**, **SMA (Smooth Muscle Actin)**, or **p63**. * **Function:** They prevent the distension of the acini when secretion pressure rises. * **Clinical Relevance:** In breast pathology, the **presence** of a myoepithelial layer is a hallmark of benign or *in situ* lesions; its **absence** is a diagnostic feature of invasive carcinoma. * **Salivary Glands:** They are most numerous in the submandibular and sublingual glands compared to the parotid.

Q: Intercalated discs are characteristic of which tissue type?

Cardiac muscle. **Explanation:** **Intercalated discs** are specialized junctional complexes found exclusively in **cardiac muscle**. They represent the interface between adjacent cardiomyocytes and are essential for the heart's function as a functional syncytium [1]. 1. **Why Cardiac Muscle is Correct:** Intercalated discs consist of three types of cell junctions: * **Fascia adherens:** Anchors actin filaments and transmits contractile forces. * **Desmosomes (Macula adherens):** Provide mechanical stability, preventing cells from pulling apart during contraction. * **Gap junctions:** Allow for rapid electrical coupling and ion flow, ensuring synchronized contraction of the myocardium. 2. **Why Other Options are Incorrect:** * **Skeletal Muscle:** These are long, multinucleated fibers formed by the fusion of myoblasts. They lack intercalated discs and function as independent anatomical units [1]. * **Hyaline Cartilage:** This is a connective tissue characterized by chondrocytes residing in lacunae within a glassy matrix. It does not contain contractile fibers or intercalated discs. * **Comp cyclone:** This appears to be a distractor/typographical error and is not a recognized histological tissue type. **High-Yield NEET-PG Pearls:** * **Step-ladder appearance:** Under light microscopy, intercalated discs give cardiac muscle a characteristic "step-like" appearance. * **Location:** They always coincide with the **Z-lines** of the sarcomere [1]. * **Clinical Correlation:** Mutations in proteins forming the desmosomes within intercalated discs (e.g., desmoplakin) are linked to **Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)**. * **Regeneration:** Cardiac muscle has virtually no regenerative capacity; damaged muscle is replaced by fibrous scar tissue.

Q: Which type of epithelium is characterized by cells possessing an extra reserve of cell membrane?

Transitional. **Explanation:** **1. Why Transitional Epithelium is Correct:** Transitional epithelium (also known as **Urothelium**) [1] is uniquely designed to withstand the stretching and toxicity of urine. The hallmark of this epithelium is the presence of **Umbrella cells** (superficial layer) which possess an **extra reserve of cell membrane**. This is stored in the form of **fusiform vesicles** (discoid vesicles) within the cytoplasm. When the bladder fills and the epithelium stretches, these vesicles fuse with the apical plasma membrane, increasing the surface area of the cell to prevent rupture. Additionally, the membrane contains specialized thickened protein plaques called **uroplakins**, which act as a barrier against the osmotic effects of urine. **2. Why the Other Options are Incorrect:** * **Stratified Squamous:** This epithelium is designed for protection against mechanical abrasion (e.g., skin, esophagus). It lacks the specialized intracellular vesicle system for membrane expansion. * **Stratified Cuboidal/Columnar:** These are relatively rare (found in large ducts of sweat glands or conjunctiva) and serve primarily as protective linings or conduits. They do not undergo the significant cyclical distension required to necessitate a membrane reserve. **3. NEET-PG High-Yield Clinical Pearls:** * **Location:** Found exclusively in the urinary tract (Renal pelvis, Ureters, Urinary bladder, and proximal part of the Urethra) [1]. * **Morphology:** In a relaxed state, cells appear dome-shaped (Umbrella cells); when stretched, they appear flattened/squamous. * **Key Feature:** It is the only epithelium that is **waterproof** due to the presence of tight junctions and uroplakin plaques. * **Pathology:** Most bladder cancers are **Transitional Cell Carcinomas (TCC)**, often associated with smoking or exposure to aniline dyes.

Q: Brush border is seen in which part of the nephron?

Proximal convoluted tubule. The **Proximal Convoluted Tubule (PCT)** is the correct answer because it is the primary site for reabsorption in the nephron [1]. To facilitate this, the PCT is lined by **simple cuboidal epithelium** featuring a dense **brush border of microvilli** on the apical surface [1]. This specialization increases the surface area approximately 20-fold, allowing for the massive reabsorption of water, glucose, amino acids, and electrolytes [1][2]. **Analysis of Incorrect Options:** * **Bowman’s Capsule:** The parietal layer consists of simple squamous epithelium, while the visceral layer contains specialized cells called **podocytes** [1]. Neither possesses a brush border. * **Distal Convoluted Tubule (DCT):** While also lined by simple cuboidal epithelium, the DCT lacks a brush border (it has only a few short, irregular microvilli). This makes the lumen of the DCT appear "cleaner" and wider under a microscope compared to the "fuzzy" lumen of the PCT. * **Loop of Henle:** The thin segments are lined by simple squamous epithelium, and the thick segments by cuboidal epithelium without a brush border. **High-Yield Clinical Pearls for NEET-PG:** * **Histology Identification:** In H&E stained sections, the PCT lumen often appears "star-shaped" or occluded due to the brush border and debris, whereas the DCT lumen appears clear and distinct. * **Mitochondria:** The PCT has a high concentration of mitochondria at the basal end (basal striations) to provide ATP for active transport (Na+/K+ ATPase). * **Clinical Correlation:** The PCT is the most metabolically active part of the nephron and is the primary site of injury in **Acute Tubular Necrosis (ATN)** caused by ischemia or toxins (e.g., aminoglycosides).

Q: Collagen is found in which of the following, except?

Fibroblasts. The core concept tested here is the distinction between **connective tissue structures** (extracellular matrix) and the **cells** that produce them [4]. **Why Option C is Correct:** **Fibroblasts** are the primary biological cells responsible for synthesizing the precursors of the extracellular matrix and collagen [4]. While fibroblasts contain the machinery to produce procollagen, they are **cells**, not structural tissues composed of collagen fibers [1]. Collagen is an extracellular protein; once synthesized, it is secreted out of the fibroblast into the extracellular space to form fibers [1]. Therefore, collagen is *produced* by fibroblasts but is not a structural component *of* the cell itself. **Why Other Options are Incorrect:** * **A. Ligament:** These are dense regular connective tissues that connect bone to bone. they are primarily composed of Type I collagen fibers arranged to resist tensile forces. * **B. Tendon:** These connect muscle to bone and consist of closely packed, parallel bundles of Type I collagen fibers. * **D. Aponeurosis:** These are pearly-white, sheet-like structures that act as flattened tendons. They are histologically identical to tendons and ligaments, consisting of dense layers of collagen. **High-Yield Clinical Pearls for NEET-PG:** * **Collagen Types:** Remember **Type I** (Bone, Tendon, Skin, Ligament), **Type II** (Cartilage), **Type III** (Reticulin/Blood vessels), and **Type IV** (Basement membrane) [3]. * **Vitamin C:** Essential for the hydroxylation of proline and lysine residues during collagen synthesis; deficiency leads to Scurvy [2]. * **Scleroderma:** Characterized by excessive systemic deposition of collagen by overactive fibroblasts.

Q: Which of the following is true about anemia of chronic disease?

Normal or increased serum ferritin. Anemia of Chronic Disease (ACD), also known as anemia of inflammation, is the second most common cause of anemia worldwide. It occurs due to the body’s inflammatory response to chronic infections, malignancies, or autoimmune disorders. **Why Option C is Correct:** The pathophysiology of ACD is driven by **Hepcidin**, an acute-phase reactant produced by the liver in response to IL-6. Hepcidin degrades ferroportin (the iron export channel), leading to: 1. **Sequestration of iron** within macrophages and hepatocytes. 2. **Decreased intestinal iron absorption.** Because iron is trapped inside storage cells, **Serum Ferritin** (the storage form of iron) remains **normal or increased**. This distinguishes ACD from Iron Deficiency Anemia (IDA), where ferritin is always low. **Why Other Options are Incorrect:** * **A. Increased TIBC:** In ACD, Total Iron Binding Capacity (TIBC) is **decreased**. The body downregulates transferrin production to limit iron availability to potential pathogens. * **B. Normal serum iron levels:** Serum iron is **decreased** in ACD because iron is "locked away" in macrophages and not available in the circulation. * **D. Increased transferrin saturation:** Since serum iron is low, the **transferrin saturation is decreased** (typically 10-20%). **NEET-PG High-Yield Pearls:** * **Hallmark:** Low serum iron + Low TIBC + Normal/High Ferritin. * **Key Mediator:** Hepcidin (inhibits ferroportin). * **Morphology:** Usually normocytic normochromic, but can become microcytic hypochromic in long-standing cases. * **Treatment:** Treat the underlying inflammatory condition; erythropoietin may be used in specific cases (e.g., CKD).

Question 1

Goblet cells are not seen in which of the following locations?

Accepted Answer

Esophagus

Answer

Colon

Answer

Trachea

Answer

Conjunctiva

Question 2

Which is the commonest site for secondary metastasis in a case of hypernephroma?

Accepted Answer

Lungs

Answer

Adrenal

Answer

Brain

Answer

Bones

Question 3

Secretory basket cells are located where?

Accepted Answer

Between secretory cells and the basal lamina

Answer

Inside secretory acini

Answer

Surrounding the intercalated duct

Answer

Surrounding the striated duct

Question 4

Intercalated discs are characteristic of which tissue type?

Accepted Answer

Cardiac muscle

Answer

Comp cyclone

Answer

Skeletal muscle

Answer

Hyaline cartilage

Question 5

Which type of epithelium is characterized by cells possessing an extra reserve of cell membrane?

Accepted Answer

Transitional

Answer

Stratified squamous

Answer

Stratified cuboidal

Answer

Stratified columnar

Question 6

Brush border is seen in which part of the nephron?

Accepted Answer

Proximal convoluted tubule

Answer

Bowman's capsule

Answer

Distal convoluted tubule

Answer

Loop of Henle

Question 7

Collagen is found in which of the following, except?

Accepted Answer

Fibroblasts

Answer

Ligament

Answer

Tendon

Answer

Aponeurosis

Question 8

A 40-year-old patient with a single kidney presents with a solitary exophytic mass of 4 cm localized at its lower pole. What is the best-recommended management option?

Accepted Answer

Partial nephrectomy

Answer

Radical nephrectomy

Answer

Radical nephrectomy with dialysis

Answer

Radical nephrectomy with renal transplantation

Question 9

Which of the following is true about anemia of chronic disease?

Accepted Answer

Normal or increased serum ferritin

Answer

Increased TIBC

Answer

Normal serum iron levels

Answer

Increased transferrin saturation

Question 10

Elastic cartilage is typically found in which of the following locations?

Accepted Answer

Pinnae

Answer

Articular ends of bones

Answer

Pubic symphysis

Answer

Larynx

Histology — MCQs

Histology — MCQs

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