Biology, asked by saurav5029, 11 months ago

(a) How many types of blood vessels are there in the human body? Name them.
(b) Why does the heart need valves?

Answers

Answered by Mangalasrinivasan949

2

Answer:

the types of blood vessels are arteries and veins..

the heart needs valves as it prevents mixing of deoxygenated and oxygenated blood...

hope it helps u dear

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