The Human Digestive System (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards

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The Human Digestive System
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Digestive system function

Breaks down food into smaller, soluble molecules

Hydrochloric acid kills...

Bacteria in food

Small intestine main function

Absorbs soluble molecules into blood

Organ producing bile

Liver

How bile helps digest fats

Emulsifies fats into smaller droplets

Large intestine function

Absorbs water from undigested food

Enzymes definition

Biological catalysts that speed up reactions

Optimum temp for enzymes

37°C

Denatured enzyme meaning

Active site shape changed, can't function

Amylase breaks down...

Starch into maltose

Proteases convert...

Proteins into amino acids

Lipases convert...

Lipids into fatty acids and glycerol

Benedict's test positive colour

Brick red

Iodine test positive colour

Blue-black

Bile neutralises...

Stomach acid (hydrochloric acid)

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