For breaks or ruptures in large arteries, the mechanism of hemostasis that must occur first is:
A)platelet plug formation
B)chemical clotting
C)vascular spasm
D)both A and B

Question

Quizplus · Accepted Answer

In cases of breaks or ruptures in large arteries, the first mechanism of hemostasis that must occur is vascular spasm. This is when the smooth muscle in the blood vessel walls contracts, which reduces blood flow and assists in limiting the amount of blood that can escape through the damaged area. Only after this does platelet plug formation and eventual chemical clotting occur.

For Breaks or Ruptures in Large Arteries, the Mechanism of Hemostasis