Question

question 4 of 10
what part of the blood closes a wound?
a. platelet
b. hemoglobin
c. plasma
d. capillary

Explanation:

Platelets are cell - fragments in the blood. When there is a wound, platelets aggregate at the site of injury. They release substances that help in the formation of a blood clot (thrombus) which plugs the wound and stops bleeding. Hemoglobin is a protein in red blood cells that carries oxygen. Plasma is the liquid part of the blood that contains various substances like proteins, nutrients, etc. Capillaries are small blood vessels, not a part of the blood itself. So, the part of the blood that closes a wound is the platelet.

Answer:

A. Platelet