Mammalian $RBCs$ are..... in shape.

Erythroblastosis fetalis (hemolytic disease of the newborn) is observed in marriages between:

The $WBC$ count of a person's blood sample is $8000/cu.mm$. How many eosinophils and lymphocytes would be in the same blood sample approximately?

The figure shows a human blood cell. Identify it and give its characteristics.

Which blood group does not contain any antibodies?

What is the significance of sodium $(Na^+)$ and potassium $(K^+)$ ions in biological systems?