Multiple Choice
Prostacyclin is a hormone that is normally active in the blood but becomes inactive when a blood vessel ruptures and hemostasis begins. Considering this, which of the following is the most likely function of prostacyclin?
17. The Blood
Platelets: Hemostasis
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Which of the following shows the correct sequence of hemostasis from start to end?
A
platelet plug formation, vascular spasm, coagulation
B
coagulation, vascular spasm, platelet plug formation
C
vascular spasm, coagulation, platelet plug formation
D
vascular spasm, platelet plug formation, coagulation
Verified step by step guidance1
Understand the concept of hemostasis, which is the process that stops bleeding and involves several key steps to prevent blood loss.
The first step in hemostasis is vascular spasm. This is an immediate response to blood vessel injury, where the blood vessels constrict to reduce blood flow and limit blood loss.
The second step is platelet plug formation. Platelets adhere to the site of injury and to each other, forming a temporary 'plug' that covers the break in the vessel wall.
The final step is coagulation, also known as blood clotting. This involves a cascade of reactions that lead to the transformation of fibrinogen into fibrin, which stabilizes the platelet plug and forms a more permanent clot.
By understanding these steps, you can identify the correct sequence of hemostasis as: vascular spasm, platelet plug formation, coagulation.
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