Match List I with List II.
List I — List II
A. Mast cells — I. Ciliated epithelium
B. Inner surface

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Question

Match List I with List II.
List I — List II
A. Mast cells — I. Ciliated epithelium
B. Inner surface of bronchiole — II. Areolar connective tissue
C. Blood — III. Cuboidal epithelium
D. Tubular parts of nephron — IV. Specialised connective tissue
Choose the correct answer from the options given below:

Accepted Answer

Correct Answer: B — A-II, B-I, C-IV, D-IIIStep-by-step Solution:A. Mast cells → II (Areolar connective tissue): Mast cells are large, oval cells found in areolar (loose) connective tissue — the loose connective tissue that underlies epithelia throughout the body, surrounding blood vessels and nerves, and filling spaces between organs. They contain large granules of histamine, heparin, and other inflammatory mediators and are involved in allergic reactions and inflammation. Mast cells are also found in the gut lamina propria, skin dermis, and respiratory mucosa.B. Inner surface of bronchiole → I (Ciliated epithelium): The larger bronchi are lined by pseudostratified ciliated columnar epithelium (with goblet cells). As airways branch and narrow, the bronchioles are lined by simple ciliated columnar or cuboidal epithelium. The cilia beat rhythmically in a coordinated manner, sweeping the mucus layer (with trapped particles and pathogens) upward toward the larynx — constituting the mucociliary escalator/clearance mechanism.C. Blood → IV (Specialised connective tissue): Blood is classified as a specialised (fluid) connective tissue. Despite looking nothing like typical connective tissue, blood shares its embryological origin (mesoderm, specifically mesenchyme) and has an extracellular matrix — the plasma (which is the liquid matrix of blood). The cellular elements (red blood cells, white blood cells, platelets) are the 'fibres' of this specialised tissue. Bone and cartilage are also specialised connective tissues.D. Tubular parts of nephron → III (Cuboidal epithelium): The proximal convoluted tubule (PCT), loop of Henle (thin limbs), and distal convoluted tubule (DCT) are lined by simple cuboidal epithelium. The cells are cube-shaped with centrally placed, round nuclei. The PCT cells have a brush border (microvilli) on their apical surface, increasing the surface area for reabsorption of glucose, amino acids, and water from the filtrate.Key Concepts:Specialised connective tissue: Blood, bone (osseous tissue), cartilage — all derived from mesoderm; have a distinct matrix.Epithelial tissue types in body: Squamous (alveoli, blood vessels), Cuboidal (kidney tubules, thyroid follicles, pancreatic ducts), Columnar (intestinal villi), Ciliated columnar/pseudostratified (trachea, bronchi, fallopian tubes), Transitional (urinary bladder).

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