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human transport - Coggle Diagram
human transport
heart
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the deoxygenated blood moves through the right ventricle which pumps it to the lungs via the pulmonary artery
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the oxygenated blood then moves through the left ventricle , which pumps it round the whole body via the aorta
the left ventricle has a much thicker wall than the right ventricle. it needs more muscle as it has to pump blood around the whole body rather than just to the lungs
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coronary heart disease
coronary heart disease is when the coronary arteries which supply the heart with blood to the muscle get blocked by layers of fatty material building up.
this causes the arteries to become narrow, so the blood flow is restricted to the heart muscles. this can lead to a heart attack
there are many riks factors involved with coronary heart disease that increase the likelihood of having it
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functions of the blood
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platelets
when you damage a blood vessel, platelets clump together to plug the damaged area
this is known as blood clotting. blood clots prevent you from losing too much blood and prevent microorganisms from entering the wound
in a clot, platelets are held together by a mesh of protein called fibrin
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red blood cells
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they are small and have a biconcave shape to give a large SA for absorbing and releasing O2 by diffusion
they contain Haemoglobin which gives blood its colour-it contains a lot of iron. in the lungs, oxygen reacts with haemoglobin to form oxyhaemoglobin. in body tissue, the reverse happens to release O2 into cells
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blood vessels
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capillaries
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they carry blood really close to the cells so that nutrients can diffuse in and waste can diffuse out of the cells
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