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Medical Mcqs

Parasympathetic stimulation of heart causes______________?

  • (A)  SA node decreases firing
  • (B)  Increased AV node excitability
  • (C)  Decreased ventricular contraction
  • (D)  Tachycardia
Submitted By :Ali Uppal


The ventricular repolarization in ECG is best seen in_______________?

  • (A)  “P” wave
  • (B)  “Q” wave
  • (C)  “R” wave
  • (D)  “T” wave
Submitted By :Ali Uppal


Peripheral resistance is maximum in_______________?

  • (A)  Aorta
  • (B)  Artery
  • (C)  Arteriole
  • (D)  Vein
Submitted By :Ali Uppal


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
Submitted By :Ali Uppal


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
Submitted By :Ali Uppal


Conduction velocity is least in_______________?

  • (A)  AV node
  • (B)  SA node
  • (C)  SA node
  • (D)  Purkinje fibers
Submitted By :Ali Uppal


Under resting condition the cardiac output is _______ L/ min ?

  • (A)  2.5
  • (B)  4.25
  • (C)  5.25
  • (D)  9.5
Submitted By :Ali Uppal


Cardiac output in L/min divided by heart rate equals_______________?

  • (A)  Cardiac efficiency
  • (B)  Cardiac index
  • (C)  Mean stroke volume
  • (D)  Mean arterial pressure
Submitted By :Ali Uppal


First heart sound occurs during the period of________________?

  • (A)  Isotonic relaxation
  • (B)  Isovolumetric relaxation
  • (C)  Isovolumetric contraction
  • (D)  Isotonic contraction
Submitted By :Ali Uppal


The effects of Adrenaline on heart are all except__________________?

  • (A)  Increases heart rate
  • (B)  Decreases myocardial irritability
  • (C)  Increases force of contraction
  • (D)  Increases oxygen uptake by heart
Submitted By :Ali Uppal