12.11

Question 1

Cholecystokinin

Answer 1

A hormone secreted by the
duodenum that regulates gastric motility
and causes the gallbladder (cholecyst)
to contract; appears to provide a satiety
signal transmitted to the brain through
the vagus nerve

Question 2

Peptide YY3-36 (PYY)

Answer 2

A chemical
produced by cells in the gastrointestinal
tract and released by the small intestine
after a meal in amounts proportional to
the calories that were just ingested; serves
as a satiety signal