The gastrointestinal phase of gastric secretion:?
a. is controlled by the entrance of acidic chyme into the duodenum.
b. leads to increased gastric secretion if duodenal pH falls below 2.
c. only stimulates gastric secretion.
d. will decrease gastric secretion when gastrin is released by the duodenum.
e. secretin acts to increase gastric secretions in the stomach.
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To answer this multiple-choice question about the gastrointestinal phase of gastric secretion, we can go through each option to determine the correct answer.
a. is controlled by the entrance of acidic chyme into the duodenum.
This statement is true. The gastrointestinal phase of gastric secretion is initiated by the presence of chyme, the partially digested food mixed with stomach acid, entering the duodenum (the first part of the small intestine).
b. leads to increased gastric secretion if duodenal pH falls below 2.
This statement is false. Gastric secretion actually decreases when the duodenal pH falls below 2. Low pH in the duodenum causes the release of secretin, which inhibits gastric secretions.
c. only stimulates gastric secretion.
This statement is false. The gastrointestinal phase of gastric secretion includes both stimulation and inhibition of gastric secretions, depending on various factors like the presence of chyme, hormonal responses, and the pH in the duodenum.
d. will decrease gastric secretion when gastrin is released by the duodenum.
This statement is true. Gastrin is a hormone released by the duodenum, and it stimulates gastric secretions. However, high levels of gastrin can inhibit further release of gastrin, leading to a decrease in gastric secretion.
e. secretin acts to increase gastric secretions in the stomach.
This statement is false. Secretin actually acts to inhibit gastric secretions. It is released in response to low pH in the duodenum and functions to decrease gastric acid production.
Based on the explanations above, the correct answer is:
d. will decrease gastric secretion when gastrin is released by the duodenum.