From which part of the organ does the digestion of food in the human body starts?

Option 1 : Mouth

The correct answer is Mouth.

• Digestion: 
  • ​it is the complex process of turning the food we eat into nutrients, which the body uses for energy, growth and cell repair needed to survive.
  • It also involves creating water to be excreted.

• Human Digestive system:​
  • The Human Digestive system consists of the alimentary canal which can be further divided into various components. a) The buccal cavity b) food pipe or esophagus c) stomach d) small intestine e) large intestine ending in the rectum f) the anus 

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• Mouth or Buccal cavity:
  • Food is taken into the body through the mouth. The process of taking food into the body is called ingestion.
  • our mouth has salivary glands which secrete saliva.
  • When we chew the food, saliva secreted from the salivary gland and mixes with food.
  • Food becomes moisten by getting mixed with saliva.
  • Partial digestion of food starts here.
• Food pipe:
  • ​The swallowed food then passes into the food pipe or esophagus.
  • Food is pushed down by the movement of the wall of the food pipe.
• The stomach: 
  • The stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal.
  • The inner lining of the stomach secretes mucous, hydrochloric acid, and digestive juices.
  • The mucous protects the lining of the stomach. 
  • The acid kills many bacteria that enter along with the food and makes the medium in the stomach acidic, which helps digestive juices to break down the proteins into simpler substances.
• The Small Intestine:
  • It is highly coiled and is about 6-8 meters long. It receives secretions from the liver and the pancreas.
  • The digested food can now pass into the blood vessels in the wall of the intestine. This process is called absorption.
  • The inner walls of the small intestine have thousands of finger-like outgrowths.
  • These are called villi. (It increases the surface area of absorption of the digested food).
• Large intestine: 
  • ​It is wider and shorter than the small intestine.
  • It is about 1.5 meters in length.
  • Its function is to absorb water and some salts from the undigested food material.