A) spleen
B) \[\text{ }\!\!\beta\!\!\text{ }\]-cells of pancreas
C) \[\alpha \]-cells of pancreas
D) mucosa of oesophagus
Correct Answer: B
Solution :
Insulin is secreted by (\[\text{ }\!\!\beta\!\!\text{ }\]-cells of pancreas. A rise in blood sugar stimulated \[\text{ }\!\!\beta\!\!\text{ }\]-cells to secrete the hormone. The hormone enhances the uptake of glucose by tissues like muscle and adipose tissue, probably by enhancing the transport of the sugar across the cell membrane. Glucagon is secreted by \[\alpha \]-cells of pancreas. It stimulates the liver to convert stored glycogen into glucose. When the blood sugar rises, the secretion of glucagon is suppressed and when it drops, the secretion of glucagon is stimulated. Spleen is a wedge shaped organ lying in between the fundus of the stomach and the diaphragm. This largest lymphoid organ of the body is connected to the blood vascular system, it is also known as blood bank. The main function of spleen are phagocytdsis. haemopoiesis and immune response. Mucosa of oesophagus is composed of three layers. [a] The thin muscularis mucosa lies next to the submucosa. [b] The lamina propria, the middle layer of mucosa, consists of loose connective tissue, blood vessels, glands and some lymphoid tissue. [c] The innermost layer is the epithelium.
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