Question

Insulin is secreted by

• A. beta cells of pancreas
• B. alpha cells of pancreas
• C. delta cells of pancreas
• D. none of these

Answer 1

The correct option is A

beta cells of pancreas

The correct option is A:

Explanation of the correct option:

1. Specialized cells known as Islets of Langerhans are present in the pancreas.
2. Each islet contains alpha cells and beta cells. Alpha cells secrete the hormone glucagon while beta cells secrete insulin directly into the bloodstream without any duct.
3. Insulin is a peptide hormone that regulates the glucose levels in the bloodstream. High levels of glucose in the bloodstream make the pancreas secrete insulin. The decrease in glucose levels in the blood inhibits insulin production causing the liver to release glucose into the blood.

Explanation of the incorrect option:

Option B:

The pancreas contains specialized cells known as Islets of Langerhans which in turn contain alpha, beta, and delta cells. Alpha cells secrete the hormone glucagon during low levels of glucose in the bloodstream.

Option C:

The pancreatic delta cells secrete somatostatin hormone which inhibits the production of glucagon and insulin by the alpha and beta cells respectively.

Option D:

Here option A beta cells of the pancreas are correct.

Final answer: Insulin is secreted by beta cells of the pancreas.