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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. Increased surface tension: This would decrease ventilation as it increases the force needed to expand the lungs.

B. Increased lung compliance: Compliance refers to how easily the lungs can expand. Increased compliance makes it easier for the lungs to inflate, thereby increasing ventilation.

C. Fewer alveolar sacs: Having fewer alveolar sacs reduces the surface area for gas exchange, which would likely reduce ventilation efficiency.

D. More airway resistance: Increased airway resistance makes it harder to breathe, so it would reduce ventilation rather than increase it.

Correct Answer is D

Explanation

A. Liver: The liver plays a role in detoxification and metabolism but is not involved in lymphocyte production.

B. Stomach: The stomach is part of the digestive system, not the immune system.

C. Small Intestine: The small intestine is involved in nutrient absorption and contains some lymphoid tissue (Peyer's patches) but is not the main site of lymphocyte production.

D. Thymus: The thymus is the organ where T-lymphocytes mature and are essential for the immune response.

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