Circulatory System MCQs

Heart of elephant is

What should be the blood types of parents in the children having only A and B types of blood?

Impulse of heartbeat originates from

Adrenaline directly affects on

Pulmonary artery differs from pulmonary vein in having

RBC in mammals have no nucleus because

Which is correct about leukocytes?

Major part of the plasma consists of

Which one of the following term is not applicable to coagulation of blood?

If haemoglobin is replaced by haemocyanin, the blood will carry