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

(D) 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


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