Transport

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Mammals have double circulatory systems

The main transport system is the blood system also known as the circulatory system. It is a network of tubes known as blood vessels.

Blood flows into the left-hand side of the heart and then goes out to the rest of the body. It is brought back to the right side of the heart and then is sent to the lungs. This is called a double circulatory system because it goes to the heart twice on one complete journey.

BLOOD BECOMES OXYGENATED AND DE-OXYGENATED

The blood in the left hand side of the heart has come fro the heart. It contains oxygen which was picked up by the capillaries surrounding the alveoli.

The oxygenated blood is then sent around the body. Some of the oxygen is taken up by the body cells which needs it for respiration. When this happens the blood becomes de-oxygenated. The de-oxygenated blood is then sent back to the right side of the heart when it is then sent to the lungs to once again to get oxygen.

THE STRUCTURE OF THE HEART

The function of the heart is to pump blood around the body. It is made of a special type of muscle known ass the cardiac muscles

Transport in Humans

The Heart