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.

1. Why did the bleeding stop?
2. What would be the colour of the wounded area and why?
3. Which type of blood cells are responsible for clotting of blood?

Answer 1

1. Bleeding stops due to coagulation/clotting of blood.
2. The colour of wounded area would initially be dark red due to the clotting of blood.
3. Platelets are responsible for the clotting of blood.