Type of food
- Strach- rice, pasta
- Sugar- sweets
Protein-Grow and repair
- Starch- iodine soloution- brown = blue/black
- Sugar- Clinistix- pink= blue/purple Benedicts reagent- blue= red
- Albustix- yellow= green Biuret's reagent- pale blue= lilac
- Filter paper- Greasy= greasy
Key words 1
- 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
Key words 2
- The amount of energy in a food is measured in kilojoules.
- Fat keeps us warm.
Saliva helps to make the food moist so that it is easy to swallow.
The food is churned up and mixed with the acid in the stomach.
The breakdown of food into smaller soluble substances.
When food is brocken down it is taken into the body through the wall of
more digestive system
Large molecules such as starch, fats and protein need to be brocken down into smaller molecules.
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.
Key words 4
- 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
small intestine question
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.
Key word 5
- 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.
The breathing system!