Digestion- foundation level

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6

The acid kills germs in the food

The gastric juice contains the protease enzyme PEPSIN to digest protein into amino acids

Food spends about 3-4 hours in here.

Slide 46

Tour guide

Mouth

Teeth √

Amylase enzyme (What are enzymes???) √

Oesophagus

Peristalsis √

Stomach

Protease enzyme

Enzymes and pH √

Pancreas

Amylase, Protease and Lipase Enzymes

Small intestine

Amylase, Protease and Lipase Enzymes

Absorption

Large intestine

egestion

Slide 47

The duodenum

The first part of the small intestine is called the duodenum.

Food, still mixed with gastric juice is squirted into it from the stomach.

The food is now a semi liquid, highly acidic mush.

It needs to be neutralised and digestion needs to be continued…

Slide 48

Liver

Slide 49

Tour guide

Mouth

Teeth √

Amylase enzyme (What are enzymes???) √

Oesophagus

Peristalsis √

Stomach

Protease enzyme

Enzymes and pH √

Pancreas √

Amylase, Protease and Lipase Enzymes

Small intestine

Amylase, Protease and Lipase Enzymes

Absorption

Large intestine

egestion

Slide 50

The small intestine

The small intestine has 3 enzymes to complete digestion:

Amylase breaks starch down into glucose.

Protease breaks protein down into amino acids.

Lipase breaks fats down into fatty acids and glycerol

Slide 51

Absorption

The food is then ABSORBED through the wall of the small intestine into the blood stream.

To do this effectively, the small intestine needs to have a large surface area.

This is achieved in the following ways:

Slide 52

Absorption 1

The tube is over 6 meters long

The inner wall of the tube has bends in it

The wall is covered in villi (small finger-like structures)

Pathway for Food

Slide 53

Absorption 2: Villi

Slide 54

After absorption: The Liver

Once the products of digestion have been absorbed, they travel in the blood to the LIVER.

The liver has many functions. Read about them on page 131 in your text book

Answer questions 4 – 7 in full sentences.