AIIMS 2019 Zoology Cardiovascular System Assertion Reason Question
Assertion: SA node malfunctioning leads to disturbance of Heart rate
Reason: SA node is the pacemaker of heart producing electric impulse for heart contraction
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The statement is true because the sinoatrial (SA) node is responsible for generating electrical impulses that initiate each heartbeat, effectively acting as the heart's natural pacemaker. When the SA node malfunctions, it disrupts the normal rhythm and rate of the heart, leading to arrhythmias. Options B, C, and D are not applicable as they do not accurately reflect the role of the SA node in cardiac function. Understanding the SA node's function is crucial for grasping how the heart maintains its rhythm and responds to physiological demands.
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