Question

digestion in stomach​

Answer 1

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Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream. Digestion is a form of catabolism that is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by digestive enzymes. In chemical digestion, enzymes break down food into the small molecules the body can use.

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Answer 2

$\textsf{ \underline { \underline { \: \: \: </strong><strong>In</strong><strong> </strong><strong>Stomach</strong><strong> \: \: \: } }}$

Here, Food is mixed with gastric juice which contains mucus, hydrochloric acid, pepsin, rennin and a weak lipase enzyme. Mucus lubricates the food and protects the inner lining of the stomach from the action of acid.

Hydrochloric acid stops the action of saliva in stomach, kills the bacteria present in the food, activates pepsin and provides acidic medium (1-2 pH) for the proper functioning of pepsin enzyme for digestion of Proteins.

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Pepsin Hydrolyses proteins yo proteoses and peptones, while lipase enzymes hydrolyses small amounts of fats into fatty acids and glycerol. Curdling of Milk is done by the enzymes rennin, which increases the period of action of pepsin on milk proteins.

$Proteins \frac{Pepsin \: \: \: }{1 - 2 \: pH}> Proteses \: + Peptones$

In addition to chemical Digestion, food also undergoes mechanical churning inside the stomach.

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