Question

Cholecystokinin and enterocrinin are secreted by
A. Intestine
B. Pancreas
C. Adrenal cortex
D. Thyroid gland

Answer 1

Hint:
Cholecystokinin and enterocrinin are the digestion-related hormones. These hormones are named after their places of effect. They play a major role in digestion. The organ that secretes these is the longest in the digestive system. Intestine is divided into two major regions namely small intestine and large intestine.

Complete answer:
CCK and enterocrinin are both hormones that play a major role in the process of digestion.
CCK is secreted by the mucosa layer of the jejunum (the middle part of the small intestine).
In the stomach, CCK decreases the secretion of gastric juices and decreases the rate at which the stomach is emptying by acting on the pyloric sphincter.
In the pancreas, CCK induces the production of digestive enzymes (trypsin, chymotrypsin, carboxy-peptidases, amylases, and lipases).
CCK affects the gallbladder by increasing the contractions to expel bile more. It also relaxes the hepatopancreatic sphincter.
Enterocrinin, on the other hand, is secreted by the duodenum of the small intestine, in response to partially digested food from the stomach (chyme) influx. It acts on the duodenum and induces the secretion of large quantities of alkaline mucus. This protects the intestinal walls from stomach acids.
The secretions of other glands are :
Pancreas – It has an endocrine component that secretes the hormones insulin and glucagon. It also secretes a range of digestive enzymes such as trypsin, chymotrypsin, carboxy-peptidases, amylases, and lipases.
Adrenal cortex – It secretes steroid hormones such as cortisol and aldosterone.
Thyroid gland – It secretes two hormones, triiodothyronine (T3) and thyroxine (T4).

The correct answer is option (A). Cholecystokinin (CCK) and enterocrinin are secreted by the intestine.

Note: Entero- is the scientific term related to intestinal structures and functions. Cholecysto- refers to gallbladder, but this hormone is not secreted from there because gallbladder is not an endocrine gland. Cholecysto-(gallbladder) + kinin (movement) gives not much information about the origin. But Entero-(intestine) + crinin (produced by) will give the indication that it is secreted by the intestine.