Which of the following cells secrete insulin?
Correct answer: D. Beta cells
- A. Alpha cells
- B. Delta cells
- C. Nerve cells
- D. Beta cells
Explanation
Beta cells in the islets of Langerhans secrete insulin, which lowers blood glucose by promoting glucose uptake and storage. Alpha cells secrete glucagon, while delta cells secrete somatostatin. Students may choose alpha cells because they are also pancreatic endocrine cells involved in glucose regulation, but their hormone has the opposite main effect.
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Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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