Question

Assertion :An artificial pacemaker can replace the sinoatrial node of heart. Reason: An artificial pacemaker is capable of stimulating the heart electrically to maintain its beats.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

An artificial pacemaker is a therapeutic instrument that is implanted in the heart of patients to generate a heartbeat. A pacemaker is used when the normal heart rate of 72-80 drops down to abnormally low levels like 30-40
due to diseases or operations and threatens the life of the patient. Sometimes, the SA node may become damaged or defective. It then fails to generate cardiac impulses at the normal rate. The heartbeats become
abnormally slow and irregular, and ventricles fail to pump the required amount of blood. This is remedied by the surgical grafting of an artificial pacemaker instrument in the chest of the patient. The artificial pacemaker

stimulates the heart electrically at regular intervals to maintain its beats. Thus it replaces the SA node as the originator of the cardiac impulse.

So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.