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In the islets of Langerhans, glucagon and insulin are secreted respectively by which cells?
ABeta cells secrete glucagon; alpha cells secrete insulin
BAlpha cells secrete glucagon; beta cells secrete insulin
CSertoli cells secrete glucagon; Leydig cells insulin
DChief cells secrete glucagon; chromaffin cells insulin
Answer & Solution
Correct answer: B. Alpha cells secrete glucagon; beta cells secrete insulin
1. The endocrine pancreas is made of the islets of Langerhans with alpha and beta cells.
2. Alpha cells secrete glucagon, which raises blood glucose.
3. Beta cells secrete insulin, which lowers blood glucose.
4. Sertoli/Leydig cells are in the testes and chief/chromaffin cells are in parathyroid/adrenal medulla, so those options are wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Pancreas (Islets of Langerhans)", p.243_
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