CBSE class 10th science - Nutrition in Human Beings

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The various steps of nutrition in human beings are as follows:

Ingestion:

In human beings, food is ingested through the mouth. The food is put into the mouth with the help of hands.

Digestion:

The digestion of food commences in the mouth itself.
The teeth cut the pabulum into small pieces, masticate and grind it. (Physical digestion)
The salivary glands in our mouth produce saliva (watery liquid) which contains an enzyme salivary amylase which digests the starch (carbohydrate) present in the food into sugar. (Chemical digestion)
Our tongue helps in mixing this saliva with food.
The digestion of food remains incomplete in the mouth.

Oesophagus:

The slightly digested food in the mouth is swallowed by the tongue and goes down the food pipe called oesophagus.
When the marginally digested food enters the victuals pipe, the walls of victuals pipe start contraction and expansion forms of kineticism called as a peristaltic movement.
This peristaltic movement of food pipe pushes the slightly digested into the stomach.

Stomach:

The stomach is a J-shaped organ present on the left side of the abdomen.
The stomach walls contain s three tubular glands in it walls which secrete gastric juice.
The gastric juice contains three substances: Hydrochloric acid, the enzyme pepsin, and mucus.
The hydrochloric creates an acidic medium which facilitates the action of the enzyme pepsin i.e. digestion of protein.
The mucus helps to protect the stomach wall from its own secretions of hydrochloric acid.
The partially digested food then goes from the stomach into the small intestine.

Read full article here ...... Nutrition in Human Beings

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