Which cells are known as the 'micro-policemen' of the blood?

Which protein is essential for the blood clotting process?

The second pregnancy of a woman terminates due to anaemia of the foetus. She has never had a blood transfusion. On the basis of this, which of the following is correct?

Explain the consequences of a situation in which blood does not coagulate.

What does a decrease in the number of blood platelets lead to?

Study the diagram given below and identify the cells labelled as $A$, $B$, $C$ and $D$, and choose the correct option.