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

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Multiple Choice

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

Explanation:
Respiratory sinus arrhythmia shows how breathing modulates heart rate through autonomic input to the SA node. When you inhale, vagal tone decreases, allowing the heart to beat a bit faster; this rise is most pronounced at peak inspiration. As you exhale, vagal tone returns and the rate slows. So the heart rate speeds up at peak inspiration. The other patterns—no change, slowing during inspiration, or speeding during expiration—don’t fit this inspiratory modulation.

Respiratory sinus arrhythmia shows how breathing modulates heart rate through autonomic input to the SA node. When you inhale, vagal tone decreases, allowing the heart to beat a bit faster; this rise is most pronounced at peak inspiration. As you exhale, vagal tone returns and the rate slows. So the heart rate speeds up at peak inspiration. The other patterns—no change, slowing during inspiration, or speeding during expiration—don’t fit this inspiratory modulation.

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