by junfei96
Last updated 8 years ago

Life Science

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Physical Digestion

Boths physical and chemical digestions take place in the mouth.The teeth break down food mechanically into smaller pieces to increase the surface area of the food exposed to the enzymes.The food is mixed with saliva produced by the salivary glands.Saliva contains the digestive enzyme,amylase,which breaks down starch in the foood into maltose.The tongue helps to mix the food with the saliva and rolls the partially digested food into a small ball to swallow into the oesophagus.

5 Stops In The Digestive System

2nd Stop: Oesophagus

Chemical Digestion

The oesophagus is a long and narrow tube joining the mouth and the stomach.The oesophagus has strong muscles which contract and relax to produce a wave-like movement that pushes the food into the stomach known as peristalsis.

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3rd Stop: Stomach

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Digestion video

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The stomach is a muscular bag which is able to expand to take in different amount of food.The muscules in the wall of the stomach contract and churn the food to mix it with gastric juice.The gastric juice contains hydrochloric acid and proteases.The proteases in the stomach digest the proteins in the food into shorter chains of amino acids while the hydrochloric acid provides the acidic condition in the stomach for the proteases to work.It also kills the bacteria which may have been swallowed with the food.

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The small intestine is where most of the chemical digestion and absorption of food take place.It is a lond and narrow tube that joins the stomach and the large intestine.As the chyme enters the small intestine from the stomach,it is mixed with secretions from the liver,pancreasand the small intestine.

4th Stop: Small Intestine

The alimentary canal, together with the salivary glands, liver, gall bladder and pancreas, form the digestive system of the human body.


1st Stop: Mouth

The undigested food moves from the small intestine into the large intestine by peristalsis.The final and shorter part of the large intestine is called the rectum and as the rectum relax,faeces is passed out of the body through the anus, known as egestion or defaecation.

5th Stop: Large Intestine

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Reflection attached to paperclip.

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