What happens when the ventricular pressure decreases?

Lymphocytes constitute how much per cent of the total WBCs?

Which of these structures prevent the mixing of fetal blood with mother’s blood?

Identify the blood vessel of the heart.

The first heart sound occurs due to the closure of the semilunar valves. True or false?

Which of the following represents the enlargement of auricles?

Which of the following organisms do not show double circulation?

Which of these are present in the plasma of a person having ‘O’ blood group?