Q91 / 200 · MHT CET - Medical 2026 (26 April Shift 1) · Biology
With reference to working of heart, complete the analogy.
Pace setter : $\underline{x}$ :: Pacemaker : $\underline{y}$
Pace setter : $\underline{x}$ :: Pacemaker : $\underline{y}$
- Correct answerAx- AV node y- SA node
- Bx- SA node y- AV node
- Cx- SA node y- Bundle of His
- Dx- Bundle of His y- SA node
Solution
The Sinoatrial (SA) node is called the pacemaker of the heart because it generates the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
The Atrioventricular (AV) node is called the pace setter of the heart. It receives the electrical impulse from the SA node, delays it slightly to allow the atria to empty their blood into the ventricles, and then transmits the impulse to the ventricles.
Thus, $x$ is the AV node and $y$ is the SA node.
Answer: x- AV node y- SA node
The Atrioventricular (AV) node is called the pace setter of the heart. It receives the electrical impulse from the SA node, delays it slightly to allow the atria to empty their blood into the ventricles, and then transmits the impulse to the ventricles.
Thus, $x$ is the AV node and $y$ is the SA node.
Answer: x- AV node y- SA node
Hence, the correct answer is option: 'A'.