digestion is…. the chemical and physical breakdown of large food molecules into smaller soluble...

Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

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Digestion is….

The chemical and physical breakdown of large food molecules into smaller soluble ones

Human Digestive System

Page 3: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Human Digestive System

AppendixRectum

Page 4: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Human Digestive System

Appendix

Mouth

Oesophagus or gullet

Liver

Gall Bladder

Anus

Large Intestine

Stomach

Pancreas

Small intestine

Rectum

Digestion

Mechanical digestion•Physical breakdown of food (moving bits)•Teeth, tongue

Chemical digestion (Mostly!)•Digestion using chemicals called enzymes•Other chemicals that help eg. Bile from liver

Page 6: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Digestive Enzymes

Amylase (a type of carbohydrase) breaks down carbohydrates like starch into sugars like glucose

Proteases break down proteins into amino acids

Lipases break down fats (lipids) into fatty acids and glycerol

Page 7: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Mouth

• The start of digestion• Food broken down by teeth (chewing)• Saliva added to soften food ready to

swallow. Saliva contains amylase that breaks down starch (carbohydrate) into sugars.

Page 8: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Oesophagus/Gullet

• A muscular tube (20cm long)• Food travels down to the stomach

after swallowing. Food travels by a process called PERISTALSIS

Page 9: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Stomach

• A muscular bag• Produces proteases enzymes to break

down proteins in food.• Contains hydrochloric acid to kill

microorganisms and help enzymes work• Acid does not digest your food for you!

Page 10: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

Where would you find protease enzymes?

1-Mouth2-Oesophagus3-Stomach

Page 11: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

Where would you find protease enzymes?

1-Mouth2-Oesophagus3-Stomach

Page 12: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

What enzyme is found in saliva?

1-Amylase2-Protease3-Lipase

Page 13: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

What enzyme is found in saliva?

1-Amylase2-Protease3-Lipase

Page 14: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

Which enzyme breaks down fats into fatty acids and glycerol?

1-Amylase2-Protease3-Lipase

Page 15: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

AfL:

Which enzyme breaks down fats into fatty acids and glycerol?

1-Amylase2-Protease3-Lipase

Page 16: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Digestion continued…

After the stomach…

Pancreas produces digestive juices with all three enzymes which go into the first part of the small intestine.

At the same time bile is released into the small intestine from the liver (makes bile) and gall bladder (stores bile). This helps to digest fat by breaking it into droplets from large pieces.

Page 17: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Small intestine

• More enzymes added to finish digestion

• Absorption of digested food takes place here

Page 18: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Large intestines

• Water adsorbed from food into blood here

Page 19: Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

Rectum

• Where waste faeces (poo) is stored before leaving the body

Anus• A ring of muscle which prevents

faeces from leaving the body until ready

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