Hemostasis is a complex process which changes blood from a fluid to a solid state. Intact blood vessels are central to moderating blood's tendency to clot. The endothelial cells of intact vessels prevent thrombus formation by secreting tissue plasminogen activator (t-PA) and by inactivating thrombin and adenosine diphosphate (ADP). Injury to vessels overwhelms these protective mechanisms and hemostasis ensues. Hemostasis proceeds in two phases: primary and secondary hemostasis.

Instant Feedback:

Vascular spasm, platelet plug formation, and clot formation all help to stop excessive blood loss after tissue injury.

Click here for more on Hemostasis, presented by Karolinska Institutet (Sweden's only medical university)

Look for the answer to this question: If the coagulation system encourages clot formation, what is the name of the system that breaks clots down?

RnCeus Homepage | Course catalog | Discount prices | Login | Nursing jobs | Help

©RnCeus.com 2012