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Nutrition Sport Level 3
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- PEARSON (PEARSON)
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Sports nutritionDigestion
Makes food available to the cells the body
The teeth physically break down large pieces of food to small ones.
Fats, proteins and carbohydrates are insoluble.
These are broken down into soluble molecules so that they can pass through the cell membrane and
be absorbed into the blood.
This chemical breakdown is catalysed by enzymes.
Swallowing and peristalsis
The tongue rolls the food into a bolus and pushes to the back of the throat-voluntary action
When the bolus touches the back of the throat an involuntary(reflex) muscle action propels the food
through the alimentary canal.
Teeth
Teeth breakdown food into small pieces
Food is also mixed with saliva which makes it easier to swallow
Saliva contains an enzyme which breaks down starch to sugars.
The small pieces of food give more surface area over which the enzyme can work.
Teeth
Enamel- very hard, strong surface for biting.
Dentine- heavy and solid to help the teeth to grind food
Pulp- blood vessels and nerves keep tooth alive and detect touch and changes in temperature.
Chemical digestion
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