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Insulin is secreted by which cells of the Islets of Langerhans?

Abeta cells
Balpha cells
Cdelta cells
Dacinar cells
Answer & Solution
Correct answer: A. beta cells
1. The Islets of Langerhans hold two main types of cell. 2. The alpha cells secrete glucagon. 3. The beta cells secrete insulin. 4. Swapping the two reverses the effect on blood sugar, which matters clinically. _Source: syllabus Biology Ch19 'Chemical Coordination and Integration', section 19.2.8_
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