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CBSE class 10th science - Nutrition in Human Beings

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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