Question

The contraction of gall bladder is due to
A) Gastrin
B) Secretin
C) Cholecystokinin
D) Enterogastrone

Answer 1

Hint:Gall bladder is a pouch like organ that is situated under the liver. This is the organ that holds bile before it is released into the small intestine. It is divided into three regions- the fundus, body and neck.

Complete answer:
The main function of gallbladder is to hold bile which it receives from the liver through hepatic and cystic ducts. Bile is a fluid that aids in the process of digestion. It is greenish yellow in colour and contains many bile salts that are responsible for digestion and absorption of fats and fat- soluble vitamins in the small intestine. When food enters into the digestive tract it stimulates the synthesis of the hormone cholecystokinin in the small intestine. In response to the release of cholecystokinin the gallbladder contracts and releases the stored bile into the common bile duct which eventually empties its contents into the duodenum. During the storage of bile in the gallbladder it gets concentrated as water and some electrolytes are absorbed from it. The bile also functions in the removal of bilirubin which is a product of haemoglobin metabolism. Excess bilirubin can cause gallbladder stones that are harmful for the body.

Hence the correct answer is option(C) Cholecystokinin.

Note:The gall bladder thus has a key role not only in the process of digestion but also removal of bilirubin that has the capacity to produce gallstones. Gallstones cause a variety of complications ranging from jaundice to cancers and so are best to be avoided.