All systems go!

Carbohydrates- Energy

• Strach- rice, pasta
• Sugar- sweets

Protein-Grow and repair 

e.g- Chicken 

Fat- Energy

e.g- oil

Carbohydrates

• Starch- iodine soloution- brown = blue/black
• Sugar- Clinistix- pink= blue/purple  Benedicts reagent- blue= red 

Protein

• Albustix- yellow= green Biuret's reagent- pale blue= lilac

Fat

• Filter paper- Greasy= greasy

• The nutrients in foods are carbohydrates,fats,protins,vitamins and minerals.
• We need fibre to keep food moving through our intestines and stop us gettinf constipated.
• We need water to dissolve things to carry them around your body

• The amount of energy in a food is measured in kilojoules.
• Fat keeps us warm.

Swallow

Saliva helps to make the food moist so that it is easy to swallow.

Stomach

The food is churned up and mixed with the acid in the stomach.

Digestion

The breakdown of food into smaller soluble substances.

Small intestine

When food is brocken down it is taken into the body through the wall of

Enzymes

Large molecules such as starch, fats and protein need to be brocken down into smaller molecules.

Large Intestine

Food that we cannot digest has water removed in the large intestine.

• Enzymes turn large molecules into smaller ones.
• Enzymes do not get used up as they carry out their tasks.
• Enzymes change shape as they work.
• Each enzyme only works on one particular type of molecule.

• Small molecules can be absorbed by the small intestine. 
• Large molecules have to be digested to turn them into smaller ones so they can absorbed, this is done by enzymes.
• Enzymes are found in the digestive juices produced by various parts of the digestive system. Saliva is an example of digestive juice 

explain how the small intestie has adapted to get food into the blood very quickly.

The larger the surface area, the faster the substances are absorbed. Villi have a large surface area and there walls are very thin.

• The walls of the small intestine have villi.
• Villi are like little fingers that stick out of the intestine.
• Absorbed food molecules go into ti y tubes called capillaries in the middle of the villi, and dissolve in the blood.
• The capillaries are joined up to a vein which carries the blood to the liver then to the heart.