Which of the following hormones stimulates the secretion of gastric juice?

$A -$ Secretin acts on the exocrine pancreas and stimulates the secretion of water and bicarbonate ions. $R -$ Cholecystokinin $(CCK)$ acts on both the pancreas and the gall bladder and stimulates the secretion of pancreatic enzymes and bile juice,respectively.

Which hormone controls the secretion of intestinal juice (succus entericus)?

What is the function of the hormone Gastrin?

Which of the following is not produced by the brush border cells of the intestinal mucosa?

$A$: Cholagogues are substances that cause contraction of the gall bladder.
$R$: These substances cause the release of $CCK-PZ$ from the duodenum.