Hemostasis | How We Stop Bleeding

The video, presented by Leslie Samuel, explains hemostasis, the process that stops bleeding. It covers three main stages: vascular spasm, platelet plug formation, and coagulation. Vascular spasm involves the contraction of smooth muscle in blood vessels to reduce blood flow. Platelet plug formation occurs when platelets adhere to the site of injury, aided by Von Willebrand Factor, and release substances like ADP and serotonin to attract more platelets. Coagulation is the final stage, where a fibrin mesh forms to stabilize the platelet plug, involving intrinsic and extrinsic pathways that activate clotting factors. The video concludes with a preview of the next topic on blood types.

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