Conduction velocity is least in_______________?
A. AV node
B. SA node
C. SA node
D. Purkinje fibers
Physiology Mcqs
Absolute refractory period in heart______________?
Absolute refractory period in heart______________?
A. Lasts till cardiac contraction
B. Longer than refractory period in skeletal muscle
C. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus
D. Corresponds with duration of action potential
E. All of the above
Increased functional demand on the heart produces increased size of the myocardium by _______________?
Increased functional demand on the heart produces increased size of the myocardium by _______________?
A. Hyperplasia
B. Hypertrophy
C. Fatty infiltration
D. Increased amounts of fibrous connective tissue
Peripheral resistance is maximum in_______________?
Peripheral resistance is maximum in_______________?
A. Aorta
B. Artery
C. Arteriole
D. Vein
Starling’s law of the heard________________?
Starling’s 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 increased
D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated
All the heart valves are open during which stage of cardiac cycle __________________?
All the heart valves are open during which stage of cardiac cycle __________________?
A. Systolic ejection
B. Isovolumetric relaxation
C. Isovolumetric contraction
D. None of the above
Cardiac output is not affected by __________________?
Cardiac output is not affected by __________________?
A. Heart rate
B. Peripheral resistance
C. Systolic blood pressure
D. Venous return
Stroke output of each ventricle in normal adult is_____________?
Stroke output of each ventricle in normal adult is_____________?
A. 30 ml
B. 130 ml
C. 70 ml
D. 5 liters
Normally, the rate of the heart beat in a human is determined by _________________?
Normally, the rate of the heart beat in a human is determined by _________________?
A. The bundle of His
B. All cardiac muscle
C. The sinoatrial node
D. The cervical ganglion
The first heart sound is produced by the_____________?
The first heart sound is produced by the_____________?
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