When food distends the duodenum, the duodenum releases the hormone CCK. By what peripheral mechanism (outside the brain) does it increase satiety? A. CCK increases stomach contractions. B. CCK...

When food distends the duodenum, the duodenum releases the hormone CCK. By what peripheral mechanism (outside the brain) does it increase satiety?
A. CCK increases stomach contractions.
B. CCK tightens the sphincter muscle between the stomach and the duodenum.
C. CCK increases the ability of nutrients to enter cells.
D. Cells in the hypothalamus release CCK as a neurotransmitter.