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Andrew [12]
3 years ago
15

HELPPPPPPP!!

Biology
1 answer:
Phoenix [80]3 years ago
3 0

Answer:

B

Explanation:

Arteries and arterioles (small arteries) have muscular walls. They're the main blood vessels involved in vasoconstriction. ... Capillaries are tiny, thin-walled blood vessels that can't constrict.

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