Biology, asked by chandangowdav2168, 4 hours ago

When and why do blood vessels constrict in the given case set?

Answers

Answered by Varshini196
1

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Blood vessels are automatically controlled by chemical signals in the body that tell the smooth muscles to constrict or dilate (widen). The nerve chemical messengers and hormones that tell blood vessels to constrict include: norepinephrine. epinephrine.

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