What substance is released by the damaged blood vessel to aid in the vascular spasm?

Question

Quizplus · Accepted Answer

Serotonin is released from the damaged blood vessel and helps to constrict the smooth muscle in the vessel wall, causing a vascular spasm. This helps to minimize blood loss and initiate the process of hemostasis. Heparin is an anticoagulant that helps to prevent blood clots, while histamine is released in response to allergies and inflammation. Thrombin is an enzyme involved in the coagulation cascade and is not released during a vascular spasm.

What Substance Is Released by the Damaged Blood Vessel to Aid