Tag: the circulatory system

Questions Related to the circulatory system

The 'cardiac pacemaker' in a patient fails to function normally. The doctors find that an 'artificial pacemaker' is to be grafted in him. It is likely that it will be grafted at the site 

cardiac cycle simple nutrients into cells the circulatory system biology

  1. Purkinje fibres

  2. Under the clavicle

  3. Atrioventricular node

  4. Bundle of His

Show answer
Correct Option: B
Explanation:
Sinoatrial (SA) node is the natural pacemaker of the heart. It generates the nerve impulses needed for heart contraction. When the SA node stops functioning, an artificial pacemaker should be implanted for proper conduction of impulse.
The artificial pacemaker is implanted inside the skin under the clavicle. In this, a vein is incised with the insertion of electrode lead through the valve of heart.
So, the correct answer is option B.