Multiple Choice
Mast cells can both constrict and dilate blood vessels after injury. Which of the following best explains why both of these events occur shortly after tissue is injured?
A) Mast cells release one chemical messenger immediately after injury that constricts vessels to promote clotting; after bleeding has stopped, they release another messenger that causes those same vessels to dilate, which increases blood flow to promote healing.
B) Mast cells release different chemical messengers, one that causes vessels away from the site of the injury to constrict to control blood loss, and another that causes vessels near the injury to dilate to promote quicker healing.
C) Mast cells release different chemical messengers, one that causes constriction in the region of blood loss, and another that causes dilation away from the injury to promote quicker healing.
D) Different blood vessels respond to the same messenger from mast cells in different ways-for example, larger vessels constrict to reduce blood loss while smaller ones dilate to promote blood flow to the injured tissue.
Correct Answer:
Verified
Correct Answer:
Verified
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