Which of the following is NOT true about the hormone CCK (cholecystokinin) ?
A) The duodenum releases CCK when food distends the duodenum.
B) CCK tightens the sphincter muscle between the stomach and duodenum.
C) CCK crosses the blood-brain barrier and inhibits cells in the hypothalamus.
D) CCK stimulates the vagus nerve and causes cells in the hypothalamus to release CCK as a neurotransmitter.
Correct Answer:
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