Glucagon is secreted by ........

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(B) The pancreas acts as both an exocrine and an endocrine gland.Its endocrine part consists of the Islets of Langerhans,which contain different types

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$\alpha$-cells of Islets of Langerhans

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(B) The pancreas acts as both an exocrine and an endocrine gland.Its endocrine part consists of the Islets of Langerhans,which contain different types of cells.These cells include $\alpha$-cells (alpha cells) and $\beta$-cells (beta cells).The $\alpha$-cells secrete the hormone glucagon,which increases blood glucose levels.The $\beta$-cells secrete the hormone insulin,which decreases blood glucose levels.Therefore,glucagon is secreted by the $\alpha$-cells of the Islets of Langerhans.

Column-$I$	Column-$II$
$A$. Alpha cells	$I$. Stimulates muscles for glycogenesis.
$B$. Beta cells	$II$. Decreases gastric secretions and absorption in digestive tract.
$C$. Delta cells	$III$. Inhibits the release of pancreatic juice.
$D$. $F$ cells	$IV$. Stimulates liver for glycogenolysis.

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