Body systems

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The release of energy from food using oxygen is called respiration. The word equation that summarises this goes: Glucose + oxygen = carbon dioxide + water +
The production of carbon dioxide can be shown by using ; it will turn .
Carbon dioxide levels are higher in air than in inhaled air.
Oxygen enters the bloodstream and carbon dioxide leaves it during gaseous , which take place in the . This process is efficient in most people, but can be badly affected by .

The functions of the blood are to materials round the body and to help us from disease.
It is composed of cells, cells and platelets, all in a liquid called .
The red cells transport , the white cells protect us from and the platelets the blood if we are cut.
The heart blood around the body. It has four chambers, the right , atrium, right and ventricle. The left ventricle wall is much , as it pumps blood to the main body; the right ventricle wall is as it pumps blood to the lungs beside it.
The blood passes through the following vessels, chambers and organs in order:
Vena , Right , Vetricle, Pulmonary Artery, Lungs, Pulmonary Vein, Left Atrium, Left Ventricle, Aorta, All body cells
Arteries carries blood from the heart, veins carry blood the heart. Capillaries are vessels that bring blood to and from all cells. Digested food is into the bloodstream and circulated to all cells.
Exercise usually the pulse and reathing rate, rest usually them.
The average pulse for an adult human is b.p.m. It is increased by exercise beacuse our need more pumped to them.
An average healthy human has a body temperature of oC. This can be affected by illness.

The function of the urinary system is to remove urea from the body. Other excretory products are and . Carbon dioxide is removed by the , and water removed by both the and the . The structure of the urinary system is: artery, vein, kidney, , , .
The blood enters the kidney in the renal . This blood is filtered and the is removed. The filtered blood returns to the body in the renal . The urea is dissolved in water to form , this is sent to the bladder via the . It is stored in the , and later released from the body via the .