Cardiovascular System Mcqs
Q.1: The first heart sound is produced by the_____________?6
A. Closure of the aortic and pulmonary valves*
B. Opening of the aortic and pulmonary valves*
C. Closure of the mitral and tricuspid valves*
D. Opening of the mitral and tricuspid valves*
Q.2: Normally, the rate of the heart beat in a human is determined by _________________?S
A. The bundle of His
B. All cardiac muscle
C. The sinoatrial node
D. The cervical ganglion
Q.3: Stroke output of each ventricle in normal adult is_____________?@
A. 30 ml
B. 130 ml
C. 70 ml
D. 5 liters
Q.4: Cardiac output is not affected by __________________?5
A. Heart rate
B. Peripheral resistance
C. Systolic blood pressure
D. Venous return
Q.5: All the heart valves are open during which stage of cardiac cycle __________________?U
A. Systolic ejection
B. Isovolumetric relaxation
C. Isovolumetric contraction
D. None of the above
Q.6: Starlings law of the heard________________?.
A. Does not operate in the failing heart%
B. Does not operate during exercise
C. Explains the increase in cardiac output that occurs when venous return is increasedS
D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulatedb
Q.7: Peripheral resistance is maximum in_______________?3
A. Aorta
B. Artery
C. Arteriole
D. Vein
Q.8: Increased functional demand on the heart produces increased size of the myocardium by _______________?f
A. Hyperplasia
B. Hypertrophy
C. Fatty infiltration
D. Increased amounts of fibrous connective tissue.
Q.9: Absolute refractory period in heart______________?2
A. Lasts till cardiac contraction
B. Longer than refractory period in skeletal muscle0
C. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulusV
D. Corresponds with duration of action potential-
Q.10: Conduction velocity is least in_______________?/
A. AV node
B. SA node
C. SA node
D. Purkinje fibers

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