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What substance stimulates pancreatic cells to secrete bicarbonate?

A.

Gastrin

B.

Secretin

C.

Somatostatin

D.

Cholecystokinin

Answer and Explanation

The Correct Answer is B

A. Gastrin: Gastrin stimulates gastric acid secretion in the stomach, not pancreatic bicarbonate.

B. Secretin: Secretin stimulates the pancreas to secrete bicarbonate, which neutralizes stomach acid in the duodenum.

C. Somatostatin: Somatostatin inhibits many digestive processes, including the release of digestive hormones, not bicarbonate.

D. Cholecystokinin (CCK): CCK stimulates the release of digestive enzymes from the pancreas but not bicarbonate.


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Related Questions

Correct Answer is B

Explanation

A. Brain and aortic arch: The aortic arch contains peripheral chemoreceptors, but the central chemoreceptor is in the medulla.

B. Medulla of the brain stem: Central chemoreceptors located in the medulla monitor the levels of carbon dioxide (via pH changes) in the cerebrospinal fluid to regulate breathing.

C. Carotid arteries and brain stem: The carotid arteries contain peripheral chemoreceptors, but not central chemoreceptors.

D. Carotid arteries and aortic arch: These locations house peripheral chemoreceptors, not central ones.

Correct Answer is D

Explanation

A. Vasa recta: This is a group of capillaries around the nephron loop (loop of Henle), not part of the distal convoluted tubule.

B. Pedicel: These are foot-like projections of podocytes in the glomerulus, not part of the distal convoluted tubule.

C. Bowman's capsule: This surrounds the glomerulus and is part of the filtration process, not the juxtaglomerular apparatus.

D. Macula densa: The macula densa is a group of cells located in the wall of the distal convoluted tubule that senses sodium concentration and regulates blood pressure and filtration rate.

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