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3.4 Explain Multi Cellular Organisms

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3.4 explanation
Multi-cellular organisms

Oxygen is transported around the body via the cardiovascular system with the assistance of red blood cells. Oxygen travels from a high concentration to a low concentration. Air firstly enters the body through the nose and/or mouth, then through the larynx, down the trachea, and into your lungs where it is then distributed around the body. In the lungs, air passes through a series of bronchial tubes to the alveoli, which diffuses into the alveoli into the tiny capillaries and into the blood stream. Arteries are the blood vessels that carry the oxygen around the body, they have muscles in them so that when the heart pumps the blood, they expand, when the heart relaxes, the muscles contract to push the

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