Digestion

Front 1

Digestion

Back 1

Digestion

Front 2

The Digestive System

Back 2

Food is physically broken down by the teeth and chemically broken down by enzymes in the digestive tract.
This is a tube about 9m long from the mouth to the anus and it forms the main part of the digestive system, alongside organs such as the pancreas, liver and gall bladder.

Front 3

Mouth

Back 3

-Saliva is produced in response to food
-It contains a substance called mucin
-It also contains salivary amylase
-The chewed-bolus is pushed through the oesophagus by contraction of the muscular walls
-The bolus enters the stomach

Front 4

Stomach

Back 4

-Food is churned by movement of the muscular walls

-it is mixed with gastric juice ph 1-3
-The HCL activates pepsin which converts protein to polypeptides
-Rennin coagulates milk
-water, glucose and alcohol are absorbed in the stomach
-jets of chime are forced into the duodenum

Front 5

Small Intestine

Back 5

-Pancreatic juice enters the duodenum
-it contains trypsin and chymotryspin which split polypeptides and proteins into amino acids
-pancreatic amylase converts starch to maltose
-lipase splits fats into glycerol and free fatty acids

Front 6

Bile

Back 6

-Bile is produced in the liver and stored in the gall bladder
-it passes into the duodenum
-it contains bile salts-emulsify fats

Front 7

Large Intestine

Back 7

-Intestinal juice contains peptidases which split polypeptides into amino acids
-maltase splits maltose into glucose
-sucrase spilts sucrose into glucose and fructose
-Lactase splits lactose into glucose and galactose

Front 8

Absorption

Back 8

-small intestine absorbs nutrients-large surface due to the villi
-the amino acids, monosaccharides, vitamins, minerals and water pass to the blood capillaries
-The glycerol and fatty acids pass to the lacteals
-fluid passes to the large intestines where it is absorbed in the rectum before faeces are passed out through the anus