A platelet is activated to initiate clotting
A) during a histamine reaction.
B) when leukocytes are activated.
C) when collagen fibers are encountered.
D) when blood flow rates drop.
E) in the presence of prothrombin.

Question

Quizplus · Accepted Answer

Platelets are activated when they encounter collagen fibers in damaged blood vessels. This initiates a complex process that leads to the formation of a blood clot to stop bleeding.

A Platelet Is Activated to Initiate Clotting