Question

While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after some time
(a) Why did the bleeding stop?
(b) What would be the colour of the wounded area and why?
(c) Which type of blood cells are responsible for clotting of blood?

Answer 1

Ans)

a) Boojho's bleeding stopped because the platelets in the blood had clotted the blood preventing blood flow from the wound.

b) The wounded area becomes dark red due to clotting of blood. The clot formed by the platelets and RBCs is deep red in colour.

c) The blood cells are responsible for blood clotting is platelets.