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Question
(a) How many types of blood vessels are there in the human body? Name them.
(b) Why does the heart need valves?
(b) Why does the heart need valves?
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Solution
(a) There are three types of blood vessels in the human body. They are arteries, veins and capillaries.
(b) Heart needs valves to regulate the flow of blood. It allows the blood to flow through the heart only in one direction.
(b) Heart needs valves to regulate the flow of blood. It allows the blood to flow through the heart only in one direction.
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