Erythropoietin: RBC Production — NEET Biology

Correct answer: D — A-(iii)-(q), B-(iv)-(r), C-(ii)-(p), D-(i)-(s)

The core concept involves matching various hormones with their specific origins and primary functions, as described in the NCERT text. Let's analyze each match: A. Gastrin: - Origin: "Gastrin acts on the gastric glands" means it's secreted by endocrine cells of the stomach. So, (iii) Endocrine cells of stomach. - Primary Function: "stimulates the secretion of hydrochloric acid and pepsinogen." So, (q) Stimulates HCl and pepsinogen secretion. - Correct match for A: A-(iii)-(q). B. Secretin: - Origin: "Endocrine cells present in different parts of the gastro-intestinal tract secrete four major peptide hormones, namely gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP)." Secretin acts on exocrine pancreas, so its origin is generally considered from duodenal mucosa. So, (iv) Endocrine cells of duodenum. - Primary Function: "stimulates secretion of water and bicarbonate ions." So, (r) Stimulates water and bicarbonate ion secretion. - Correct match for B: B-(iv)-(r). C. Cholecystokinin (CCK): - Origin: Similar to secretin, it is an endocrine cell product of the gastrointestinal tract, specifically the duodenum. So, (ii) Endocrine cells of duodenum. - Primary Function: "stimulates the secretion of pancreatic enzymes and bile juice, respectively." So, (p) Stimulates pancreatic enzymes and bile secretion. - Correct match for C: C-(ii)-(p). D. Erythropoietin: - Origin: "The juxtaglomerular cells of kidney produce a peptide hormone called erythropoietin." So, (i) Juxtaglomerular cells. - Primary Function: "which stimulates erythropoiesis (formation of RBC)." So, (s) Stimulates erythropoiesis. - Correct match for D: D-(i)-(s). Combining these, the correct option is D. A-(iii)-(q), B-(iv)-(r), C-(ii)-(p), D-(i)-(s). Tested concept: Origins and functions of hormones from the gastrointestinal tract and kidney.