Food and our bodies (1)

Gap-fill exercise

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Our body needs chemicals, called , to stay alive. The main nutrients are , proteins and fats. We also need small amounts of minerals and . We also need to drink to survive. The chemicals in foods are made up from large molecules. Our body needs to break down these large molecules. This process is called . are chemicals which break down the long molecules into smaller molecules. The process of digestion changes carbohydrates into glucose, proteins into acids, and fats into fatty and . The small molecules then pass though the small intestine into the blood. This process is called . Some chemicals cannot be digested but they help the digestion process. This is the contained in most foods.

When proteins are broken down acids are made. These are used to make new cells, to repair them and for . Excess amino acids are removed from the body by the , and they are changed into , which is less harmful. This substance is then removed from your body by the . The liver also changes other harmful chemicals into harmless chemicals which can then be .

The energy needed for the body to function comes from molecules, which are obtained by breaking down . The glucose reacts with inside the cells, providing energy. This process is called . Carbon dioxide is produced in this process, and this gas needs to be removed. The blood carries this gas to the . It is then excreted when a person out. . Carbon dioxide is produced in this process, and this gas needs to be removed. The blood carries this gas to the . It is then excreted when a person out.