Body Fluids and Circulation, Quiz 9

Which among the following is correct during each cardiac cycle?

• (a) The volume of blood pumped out by the Rt and Lt ventricles is same.

• (b) The volume of blood pumped out by the Rt and Lt ventricles is different

• (c) The volume of blood received by each atrium is different

• (d) The volume of blood received by the aorta and pulmonary artery is different

ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

• (a) Depolarisation of atria

• (b) Repolarisation of atria

• (c) Depolarisation of ventricles

• (d) Repolarisation of ventricles

Valves occur in

• (a) Arteries, veins and auricles

• (b) Atria, ventricles and veins

• (c) Arteries, veins and ventricles

• (d) SA node, AV node and veins.

Blood pressure in the pulmonary artery is :-

• (a) same as that in the aorta.

• (b) more than that in the carotid.

• (c) more than that in the pulmonary vein.

• (d) less than that in the venae cavae.

What vessels hold the largest percentage of the blood supply?

• (a) artery

• (b) arteriole

• (c) capillary

• (d) vein

Blood flow velocity is slowest in the

• (a) Arteries

• (b) Arterioles

• (c) Capillaries

• (d) Venules

Arteries have __________ and ___________ walls when compared to veins

• (a) Thicker; stronger

• (b) Thicker; weaker

• (c) Thinner; stronger

• (d) Thinner; weaker

Which phase of the ECG indicates ventricular excitation and contraction?

• (a) P wave

• (b) QRS wave

• (c) T wave

• (d) XYZ wave

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

• (a) 50 beats per minute

• (b) 75 beats per minute

• (c) 100 beats per minute

• (d) 125 beats per minute

A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. This delay allows

• (a) the atria to empty completely.

• (b) blood to enter aorta.

• (c) the ventricles to empty completely.

• (d) blood to enter pulmonary arteries.