Blood - The process of blood clotting, or hemostasis, stops blood loss
3 important questions on Blood - The process of blood clotting, or hemostasis, stops blood loss
What is a vascular spasm? What is the vascular phase?
Contraction of smooth muscle fibers of vessel wall, triggered by cutting of this wall. Spasm decreases diameter of vessel. Period of vascular spasm is the vascular phase.
What happens during the vascular phase?
- Endothelial cells contract exposing the undelrying basement mebrane to the bloodstream
- Endothelial cells release chemical factors and local hormones.
- Endothelial plasma membrane becomes sticky; walls of opposite side might stick together to prevent blood flow and aids in platelet attachment.
What is clot retraction?
Torn edges of vessel are pulled closer together to reduce bleeding and stabilize the injury. Reduces size of damaged area.
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