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11/10/2021 6:19 pm
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(a) How many types of blood vessels are there in the human body? Name them.
(b) Why does the heart need valves?
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11/10/2021 6:20 pm
(a) There are three types of blood vessels - arteries, veins and capillaries.
(b) Heart needs valves to prevent the backflow of blood so that the blood flows only in one direction.