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Question

Insulin is secreted by:

A
Beta cells of Islets of Langerhans
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B
Alpha cells of Islets of Langarhans
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C
Kupffer cells
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D
Gall bladder
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Solution

The correct option is A Beta cells of Islets of Langerhans
Pancreas is a composite gland which acts as both exocrine and endocrine gland. The endocrine pancreas consists of ‘Islets of Langerhans’. There are about 1 to 2 million Islets of Langerhans in a normal human pancreas representing only 1 to 2 per cent of the pancreatic tissue. The two main types of cells in the Islet of Langerhans are called α-cells and β-cells. The α−cells secrete a hormone called glucagon, while the β−cells secrete insulin.

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