$Thrombocytes$ are cell fragments rather than true cells.

Which are the most active white blood cells?

In the embryonic stage,$RBCs$ develop in:

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

You are required to draw blood from a patient and to keep it in a test tube for the analysis of blood corpuscles and plasma. You are provided with the following four types of test tubes. Which of them will you $NOT$ use for this purpose?

.............. blood group individuals are called 'universal donors' and .......... blood group individuals are called 'universal acceptors'.