Multiple Choice
In the process of hemostasis, which of the following substances normally helps keep blood from clotting in intact, uninjured vessels?
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17. The Blood
Platelets: Hemostasis
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In hemostasis, what is the primary function of blood platelets (thrombocytes)?
A
Initiate vasodilation by releasing histamine during allergic reactions
B
Form a platelet plug and release factors that promote blood clotting at sites of vascular injury
C
Provide long-term immunity by producing antibodies against pathogens
D
Transport oxygen and carbon dioxide between the lungs and tissues
Verified step by step guidance1
Understand the process of hemostasis, which is the body's mechanism to stop bleeding and repair damaged blood vessels.
Identify the role of blood platelets (thrombocytes) in hemostasis, focusing on their ability to respond quickly to vascular injury.
Recognize that platelets adhere to the site of injury and aggregate to form a temporary platelet plug, which helps reduce blood loss.
Know that platelets release chemical factors that promote further blood clotting by activating the coagulation cascade, stabilizing the plug.
Differentiate the function of platelets from other blood components, such as white blood cells (immunity) and red blood cells (gas transport), to confirm their primary role in clot formation.
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