What is the effect of sympathetic tone on heart rate?

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Multiple Choice

What is the effect of sympathetic tone on heart rate?

Explanation:
Sympathetic tone produces a positive chronotropic effect, meaning it increases heart rate. It does this by activating beta-1 adrenergic receptors in the SA node, which raises cAMP and enhances the funny current and calcium entry. This speeds up the rate of spontaneous depolarization and increases conduction through the AV node, resulting in a faster heart rate. In contrast, parasympathetic activity slows the rate, and sympathetic stimulation does not normally cause no effect or an irregular rhythm.

Sympathetic tone produces a positive chronotropic effect, meaning it increases heart rate. It does this by activating beta-1 adrenergic receptors in the SA node, which raises cAMP and enhances the funny current and calcium entry. This speeds up the rate of spontaneous depolarization and increases conduction through the AV node, resulting in a faster heart rate. In contrast, parasympathetic activity slows the rate, and sympathetic stimulation does not normally cause no effect or an irregular rhythm.

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