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What is digestion?

Digestion is the process by which food is converted into substances
that can be absorbed and assimilated by the body.

This is accomplished by the mechanical and enzymatic breakdown of foods into
simpler chemical compounds.

The Stages of Digestion...

· Ingestion- taking large pieces of food…

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Peristalsis is the process of wave like muscle contractions in the alimentary tract
that move food along

The Mouth

· Teeth- the chewing motion of the teeth breaks down the food (this
increase surface area) and forms a bolus/ ball.
· Salivary glands- secrete: saliva (to dissolve soluble substances), mucus…

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The Small Intestine

The small intestine is 6.5 metres long and is divided into three sections...
the duodenum, the jejunum and the ileum.
The duodenum most of the digestion takes place here.
Pancreatic juice is secreted by the pancreas through the pancreatic duct. It contains
carbohydrase, protease and lipase enzymes…


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