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B4.1-B4.4 (The Blood (Red blood cells: (are biconcave discs and do not…
B4.1-B4.4
The Blood
Multicellular organisms need a transport system to move material between exchange surfaces. The human circulatory system consists of the blood, the blood vessels, and the heart.
Blood is a tissue. The liquid plasma contains red blood cells, white blood cells, and platelets.
Blood plasma transports many substances, including:
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Red blood cells:
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use their haemoglobin to combine with oxygen, which forms oxyhaemoglobin in the lungs.
carry the oxygen to all the organs, where the oxyhaemoglobin splits back into haemoglobin and oxygen.
White blood cells:
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Some white blood cells produce antibodies, some produce antitoxins, and others engulf microorganisms.
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The Blood Vessels
Blood flows round the body in three main types of blood vessel: arteries, veins and capillaries.
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