Answer:
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:
The vessel spasm phase is the first stage of blood clotting that involves constriction of the blood vessels near the wound site to prevent blood loss. Thus, option B is correct.
Blood-clotting reaction is a series of events that occurs to stop the bleeding and heal the wound or the injured area. The blood-clotting reaction includes the constriction, platelet plug, and coagulation cascade.
The constriction of the blood vessels near the wounded area is the foremost step that takes place. In this step, the spasm causes the vessels to constrict and restrict the flow of blood to the injured area.
Therefore, the blood vessels constrict in the vessel spasm phase of the blood-clotting mechanism.
Learn more about the blood-clotting reactions here:
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