Study With Me : Introduction to Blood Transfusion 34

Question 183:

What does the term "haemostasis" refer to?

Haemostasis refers to the control of bleeding, the formation of a clot, and, during the healing process, the resolution of the clot and a return to normal.

Question 184:

What is vasoconstriction in the context of haemostasis?

Vasoconstriction is the contraction or tightening of a damaged blood vessel's muscular wall to minimize further blood loss.

Question 185:

What is the role of thromboplastin in haemostasis?

Thromboplastin is released after injury, and in the presence of calcium ions (Ca++), it combines with prothrombin to form thrombin, which activates platelets, initiating the haemostatic process.

Question 186:

How do activated platelets contribute to haemostasis?

Activated platelets amplify the haemostatic response by activating more platelets, and fibrinogen stimulates their sticking together, forming a soft plug that blocks the wound, slowing down bleeding.