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Medical Mcqs

Increase in carotid sinus pressure produces__________________?

  • (A)  Reflex hyperpnea
  • (B)  Reflex Hypercapnia
  • (C)  Reflex tachycardia
  • (D)  Reflex Hypercapnia
Submitted By :Ali Uppal

SA node acts as a pacemaker of the heart because of the fact that it_________________?

  • (A)  is capable of generating impulses
  • (B)  Has rich sympathetic innervation
  • (C)  Has poor cholinergic innervation
  • (D)  Generates impulses at the highest rate
Submitted By :Ali Uppal

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
Submitted By :Ali Uppal

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
Submitted By :Ali Uppal

Stroke output of each ventricle in normal adult is_____________?

  • (A)  30 ml
  • (B)  130 ml
  • (C)  70 ml
  • (D)  5 liters
Submitted By :Ali Uppal

Cardiac output is not affected by __________________?

  • (A)  Heart rate
  • (B)  Peripheral resistance
  • (C)  Systolic blood pressure
  • (D)  Venous return
Submitted By :Ali Uppal

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
Submitted By :Ali Uppal

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
Submitted By :Ali Uppal

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