The digestive system

the digestive system

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The digestive system

Food is broken down into substances that our bodies can use. This is called Digestion& with out digestion we caouldn't absorb food into our bodies & use it.

Digestion happens in the Digestive system which begins at the mouth& ends at the ****.

Food passes through these organs:

oesophagus

stomach

small intestine

large intestine

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Stages of digestion:

Food is digested in the mouth, stomach& small intestine.

Digested food is absorbed into bloodstream in the small intestine.

Excess water is absorbed  back into the body in large intestine.

Undigested food passes out of the **** as faeces.

Liver produces bile which helps digestion of fat. The pancreas produces pancreatic juice aslo know as digestive enzymes.

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Passage of food in the gut/ stages of the digestiv

Ingestion- food enters the mouth/beginning of digestive system

Digestion- Food is broken down into smaller molecules

Absorption- Food is absorped into the blood

Egestion- Waste products are excreted.

Mouth- Grind/chew food. Amylase in saliva.

Oesophagus- Food pushed through the Gullet into the stomach.

Stomach- Food is churned&mixed with acid&enzymes. Enzyme Pepsin digests proteins. Works best at pH2.

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Small intestine: Pancreatic juice is added. Contains Amylase-Starch digestion

Lipase-fats digestion, Trypsin- Protein digestion.

Pancreatice juice is Alkaline. Bile from liver is added, helps break down fats. Bile&pancreatic juice are BOTH Alkaline.

Food is absorbed into blood.

Bile neutralises acid in the stomach.

Food particles Diffuse into the blood& are carried around the body

 

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Large intestine- water is absorbed.

Rectum- Solid waste/faeces are stored in this part of large intestine/rectum before passing out of the body via the ****.

Villi- tiny finger like projections in small intestine. They increase the surface area of small intestine. Helps absorption of food through the walls of the intestine to the blood.

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