How does a laceration stop bleeding?

How does a laceration stop bleeding?

• A. Blood vessels constrict
• B. Blood vessels dilate
• C. Clots dissolve immediately
• D. Skin expands freely

Answer: (A)

When a laceration occurs, the vessels constrict to stop the bleeding. Narrowing the damaged vessels dramatically reduces blood flow into the wound, which slows blood loss right away and buys time for the clotting process to catch up. Platelets then adhere to the exposed tissue and a coagulation cascade forms a fibrin clot to stabilize the seal. Dilation would increase bleeding, clots dissolving immediately would undo the seal, and skin expanding freely doesn’t influence the bleeding at the vessel level.

When a laceration occurs, the vessels constrict to stop the bleeding. Narrowing the damaged vessels dramatically reduces blood flow into the wound, which slows blood loss right away and buys time for the clotting process to catch up. Platelets then adhere to the exposed tissue and a coagulation cascade forms a fibrin clot to stabilize the seal. Dilation would increase bleeding, clots dissolving immediately would undo the seal, and skin expanding freely doesn’t influence the bleeding at the vessel level.