A balanced diet has - carbohydrate, protein, fat, vitamins, mineral salts & fibre;
Carbohydrate gives you energy;
Protein is needed for growth & repair;
Fats contain fat soluble vitamins;
Vitamins are essential in SMALL quantities;
Mineral salts are also essential, e.g. Calcium, Iron & Iodine;
Enzymes are needed to digest carbohydrate, proteins and fats;
Enzymes are substrate specific;
Enzymes work better at body temperature;
Enzymes only work at their optimum pH;
Villi absorb glucose, amino-acids, fatty acids, glycerol, vitamins and minerals;
Villi have a large surface area.
Green plants contain a chemical called chlorophyll;
Chlorophyll is used in photosynthesis;
Photosynthesis uses light energy to make glucose;
Photosynthesis takes place in the mesophyll of a leaf;
Photosynthesis also requires Carbon Dioxide and water;
Glucose can be used in respiration or stored as starch;
Iodine and starch turn black;
Green light is not used in photosynthesis;
Increasing the light intensity will make photosynthesis faster.
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