In sinus arrhythmia, how does heart rate change during expiration?

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Multiple Choice

In sinus arrhythmia, how does heart rate change during expiration?

Explanation:
Respiratory sinus arrhythmia is a normal fluctuation of heart rate with breathing caused by autonomic control of the SA node. The vagal (parasympathetic) influence on the heart changes with the respiratory cycle: vagal tone decreases during inspiration, allowing the heart rate to rise, and vagal tone increases during expiration, slowing the heart rate. So, during expiration the heart rate slows down, not speeds up or stays high. This pattern—faster with inspiration, slower with expiration—is typical in healthy individuals, especially younger people.

Respiratory sinus arrhythmia is a normal fluctuation of heart rate with breathing caused by autonomic control of the SA node. The vagal (parasympathetic) influence on the heart changes with the respiratory cycle: vagal tone decreases during inspiration, allowing the heart rate to rise, and vagal tone increases during expiration, slowing the heart rate. So, during expiration the heart rate slows down, not speeds up or stays high. This pattern—faster with inspiration, slower with expiration—is typical in healthy individuals, especially younger people.

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