Answer :
The statement about secretin that would NOT be true is:
A) It increases bile output.
Secretin is a hormone primarily involved in the regulation of pancreatic and gastric functions. While secretin plays a crucial role in digestive processes, it does not directly increase bile output.
Bile production and secretion are mainly controlled by cholecystokinin (CCK), another hormone released by the duodenum. CCK stimulates the contraction of the gallbladder, causing the release of stored bile into the small intestine to aid in the digestion and absorption of fats.
In contrast, secretin primarily acts on the pancreas, stimulating the secretion of pancreatic juice. This pancreatic juice contains bicarbonate ions, which help neutralize the acidic chyme from the stomach as it enters the small intestine.
Secretin also inhibits gastric gland secretion, reducing the secretion of gastric acid and enzymes, and it inhibits gastric motility, slowing down the movement of food through the stomach.
Therefore, statement A, which suggests that secretin increases bile output, is not true.
It is important to recognize the specific roles of secretin and other hormones, such as CCK, in regulating different aspects of digestion to understand their functions accurately.
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