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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 ?
(a) There are three types of blood vessels present in the human body.
They are arteries, veins, and capillaries.
(b) The heart needs valves to prevent the backflow of blood so that the blood moves only in one direction.
Updated on: 24-Mar-2023
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