Circulatory System

Which heart valves are NOT actively closed by the contraction of muscular structures?

• Mitral valves

• Atrioventricular valves

• Tricuspid valves

• Semilunar valves

In terms of being open or closed, what is the state of the mitral and tricuspid valves (left and right atrioventricular valves, respectively) at the end of the first heart sound?

• Mitral is closed, tricuspid is open

• Mitral is open, tricuspid is closed

• Both are open

• Both are closed

The colour of a red blood cell is due to (a)  

The oxygen-rich blood from the lungs comes into the (a)   of the heart.

The only artery which carries deoxygenated blood is called,

• Hepatic artery

• Pulmonary artery

Pulmonary vein carries

• Oxygenated blood

• Deoxygenated blood

The function of WBCs is to

• Help in the clotting of blood

• Provide immunity

Blood capillary is a

• Vein with a large lumen

• A narrow tube made up of endothelium only.

The nucleus is absent in

• RBCs

• WBCs

Sphygmomanometer measures:

• Heart Beat

• Blood Pressure