What occurs during the vessel spasm phase of the blood-clotting reaction?
Platelets aggregate at, and block, the wound.
Blood vessels near the wound site constrict.
Fibrin forms and attaches to the wound site.
Endothelial cells divide in the broken vessel.

Vascular spasm is the first response as the blood vessels constrict to allow less blood to be lost. In the second step, platelet plug formation, platelets stick together to form a temporary seal to cover the break in the vessel wall. The third and last step is called coagulation or blood clotting.

Explanation:

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