Conduction velocity is least in_______________? A. AV node B. SA node C. SA node D. Purkinje fibers

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…

Increased functional demand on the heart produces increased size of the myocardium by _______________? A. HyperplasiaB. Hypertrophy C. Fatty infiltration D. Increased amounts of fibrous connective tissue

Peripheral resistance is maximum in_______________? A. Aorta B. ArteryC. Arteriole D. Vein

Starling’s law of the heard________________? A. Does not operate in the failing heart B. Does not operate during exerciseC. Explains the increase in cardiac output that occurs when venous return is increased D. Explains the increase in cardiac output when…

All the heart valves are open during which stage of cardiac cycle __________________? A. Systolic ejection B. Isovolumetric relaxation C. Isovolumetric contractionD. None of the above

Cardiac output is not affected by __________________? A. Heart rate B. Peripheral resistanceC. Systolic blood pressure D. Venous return

Stroke output of each ventricle in normal adult is_____________? A. 30 ml B. 130 mlC. 70 ml D. 5 liters

Normally, the rate of the heart beat in a human is determined by _________________? A. The bundle of His B. All cardiac muscleC. The sinoatrial node D. The cervical ganglion

The first heart sound is produced by the_____________? A. Closure of the aortic and pulmonary valves B. Opening of the aortic and pulmonary valvesC. Closure of the mitral and tricuspid valves D. Opening of the mitral and tricuspid valves