MOST IMPORTANT MCQS FROM THE CIRCULATORY SYSTEM:

1. In humans the circulatory system is
a. closed type
b. open type
c. both closed and open type
d. none
2. The heart is prevented from overexpansion by the
a. pericardium 
b. myocardium
c. endocardium
d. all
3. Arteries and veins have
a. 2 layers
b. 3 layers
c. 4 layers
d. 5 layers
4. The aortic and pulmonary semilunar valves close during
a. ventricular systole
b. ventricular diastole
c. atrial systole 
d. atrial diastole
5. Which of the following is the most elastic
a. Aorta
b. Pulmonary artery
c. Superior vena cava
d. Inferior vena cava
6. The veins that carry blood from the lungs to the heart are
a. Pulmonary veins
b. Vena cava
c. Iliac vein
d. both a and b
7. Heart receives
a. Oxygenated blood only
b. Deoxygenated blood only
c. both a and b
8. All of the following receive both oxygenated and deoxygenated blood except
a.  Heart
b. Liver
c. Spleen
d. none
9. For depolarization in the myocardium which ions are responsible
a. Na+
b. Ca++
c. K+
d. Cl-
10. The heart is located in the
a. Chest cavity
b. Abdominal cavity
c. Pelvic cavity
d. none
11. statements
a. Arteries are more elastic than veins
b. Blood pressure is low in veins
c. Arteries carry blood towards the heart
How many of the above statements are correct
A. 1
B. 2 
C. 3
D. none
12. Auricles and ventricles contract at the same time
a. statement is true
b. statement is wrong
13. Most muscular chamber of the heart is 
a. Right auricle
b. Left auricle 
c. Right ventricle
d. Left ventricle
14. The aorta pumps the blood into the
a. Systemic circuit
b. Pulmonary circuit
c. Portal circuit
d. none
15. Capillaries are
a. Single layered
b. Double layered
c. Triple-layer
d. Four layered
16. Which veins need more valves
a. Veins in the head and neck region
b. Veins in the arms and feet
c. All veins have an equal no of valves
d. none
17. Plasma can be filtered out of the blood through
a. Arteries
b. Veins
c. Capillaries
d. none
18. Which of the following has greater lumen
a. Arteries
b. Veins
c. Capillaries 
d. Arterioles
19. Blood flow is the slowest in
a. Arteries
b. Veins
c. Capillaries
d. Arterioles
20. Heart of crocodile is
a. 2 chambered
b. 4 chambered
c. 3 chambered
d. none
Answer key
1. A
2. A
3. B
4. B
5. A
6. A
7. C
8. C
9. B
10. A
11. B
12. B
13. D
14. A
15. A
16. B
17. C
18. B
19. C
20. B
Comment down your score. If you have a problem do write it down.