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The 3 stages in which the food which is eaten travels.
Stage 1: -Mouth:
Oral stage of digestion –
Chewing food breaks it down into smaller particles and mixes them with saliva.
An enzyme present in saliva, called amylase, acts on carbohydrates in the food to break them down. The food particles can then form a soft mass that’s easy to swallow, known as a bolus.
Stage 2: -Stomach
Gastric stage of digestion
In the stomach, an enzyme called pepsin helps to break down proteins into smaller particles.
Stomach acid also plays an important role in preventing food-borne illness as it kills any bacteria or viruses that may have been present in the food.
Stage 3: – Intestines:
Intestinal stage of digestion –
Nutrients and water that have been removed from the digested food pass through the walls of the small intestine.
They enter the bloodstream and travel to various areas of the body where they are used to repair and build the body.
The unabsorbed and undigested food that remains then moves to the large intestine.
Here, some more nutrients and water are absorbed. The remainder is stored in the rectum until it leaves the body through a bowel movement.
Human digestive system
