Question

A hormone, secreted by the endocrine cells of duodenal mucosa which influences the release of pancreatic juice is
A. Relaxin
B. Cholecystokinin
C. Secretin
D. Progesterone

Answer 1

Hint: The endocrine cells are present in the pancreas. These cells are responsible for producing and releasing molecules of hormone into the bloodstream. The finger-like projections distributed at the gastroduodenal junction is called the mucosa. The pancreatic juice is responsible for the digestion of the food by enzymes. They help to break down sugars, fats, and starches.

Complete answer:
> Option B: The hormone that is produced by the mucosa of the small intestine is cholecystokinin (CCK). It helps in the stimulation of the release of pancreatic juice. The cells of cholecystokinin are produced by the I-cells which are present in the duodenum lining and also release some neurons in the brain. It is a peptide hormone that helps in the digestion of fat and protein. It also acts as a hunger suppressant.

> Option A: The hormone which is produced by the corpus luteum at the end of the gestation period is called relaxation. The uterus cervix relaxes when relaxin release and pelvic girdle ligaments ease the birth of the young one.

> Option C: The hormone that regulates the homeostasis of water throughout the body and influences the environment of the duodenum is called secretin. It is present in the small intestine and a peptide hormone.

> Option D: The hormone which is released by the corpus luteum and suspends ovulation at the time of pregnancy is called progesterone. It helps in fixing the fetus to the wall of the uterus, placenta formation, and controls the fetus’s development in the uterus.

Hence, the correct answer is option (B).

Note: The CCK is the hormone that is produced by the mucosa of the small intestine. Thus, different hormones function differently. The pancreas secretes various digestive juices and enzymes which helps food digestion. The CCK secretion is stimulated by hydrochloric acid introduction into the stomach or duodenum.