Medical MCQs with Answers

This is medical MCQs section with detailed explanations for preparation of screening tests, interviews for government jobs. In this section candidate will learn MCQs on variety of topics from the subject.

1. 5101 SA node acts as a pacemaker of the heart because of the fact that it_________________?
   

   1. is capable of generating impulses

   2. Has rich sympathetic innervation

   3. Has poor cholinergic innervation

   4. Generates impulses at the highest rate

   See Answer

   Added By: Admin

   Answer

   : Generates impulses at the highest rate

   Explanation

   :
   N/A

2. 5102 Increase in carotid sinus pressure produces__________________?
   

   1. Reflex hyperpnea

   2. Reflex Hypercapnia

   3. Reflex tachycardia

   4. Reflex Hypercapnia

   See Answer

   Added By: Admin

   Answer

   : Reflex Hypercapnia

   Explanation

   :
   N/A

3. 5103 The effects of Adrenaline on heart are all except__________________?
   

   1. Increases heart rate

   2. Decreases myocardial irritability

   3. Increases force of contraction

   4. Increases oxygen uptake by heart

   See Answer

   Added By: Admin

   Answer

   : Decreases myocardial irritability

   Explanation

   :
   N/A

4. 5104 First heart sound occurs during the period of________________?
   

   1. Isotonic relaxation

   2. Isovolumetric relaxation

   3. Isovolumetric contraction

   4. Isotonic contraction

   See Answer

   Added By: Admin

   Answer

   : Isovolumetric contraction

   Explanation

   :
   N/A

5. 5105 Cardiac output in L/min divided by heart rate equals_______________?
   

   1. Cardiac efficiency

   2. Cardiac index

   3. Mean stroke volume

   4. Mean arterial pressure

   See Answer

   Added By: Admin

   Answer

   : Mean stroke volume

   Explanation

   :
   N/A

6. 5106 Under resting condition the cardiac output is _______ L/ min ?
   

   1. 2.5

   2. 4.25

   3. 5.25

   4. 9.5

   See Answer

   Added By: Admin

   Answer

   : 5.25

   Explanation

   :
   N/A

7. 5107 Conduction velocity is least in_______________?
   

   1. AV node

   2. SA node

   3. SA node

   4. Purkinje fibers

   See Answer

   Added By: Admin

   Answer

   : AV node

   Explanation

   :
   N/A

8. 5108 Absolute refractory period in heart______________?
   

   1. Lasts till cardiac contraction

   2. Longer than refractory period in skeletal muscle

   3. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

   4. Corresponds with duration of action potential

   5. All of the above

   See Answer

   Added By: Admin

   Answer

   : All of the above

   Explanation

   :
   N/A

9. 5109 Increased functional demand on the heart produces increased size of the myocardium by _______________?
   

   1. Hyperplasia

   2. Hypertrophy

   3. Fatty infiltration

   4. Increased amounts of fibrous connective tissue

   See Answer

   Added By: Admin

   Answer

   : Hypertrophy

   Explanation

   :
   N/A

10. 5110 Peripheral resistance is maximum in_______________?
    

    1. Aorta

    2. Artery

    3. Arteriole

    4. Vein

    See Answer

    Added By: Admin

    Answer

    : Arteriole

    Explanation

    :
    N/A