Hemostasis - Hemostasis Hemostasis,thestoppageofbleeding,

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Hemostasis Hemostasis,  the stoppage of bleeding,  is accomplished through three steps: class="numbered"> •   A vascular spasm, a constriction of  the damaged blood vessel, occurs at  the site of injury. Vasoconstriction  is  initiated by the smooth muscle of the  blood vessel in response to the injury  and by nerve signals from pain  receptors. •   A platelet plug, consisting of a mass  of linked platelets, fills the hole in the  damaged blood vessel. Platelet plug  formation follows these steps:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1. Platelet adhesion.  Platelets  adhere to the exposed collagen  fibers in the damaged blood  vessel wall. 2. Platelet release.  Platelets  release ADP (adenosine  diphosphate, which attracts other  platelets to the injury), serotonin  (which stimulates  vasoconstriction), and  thromboxane A 2  (which attracts  platelets and stimulates  vasoconstriction, and keeps the  platelets “sticky” so they continue  to adhere to the injured site).  Cellular extensions from the 
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Hemostasis - Hemostasis Hemostasis,thestoppageofbleeding,

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online