ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increases Heart Rate
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Decreases Heart Rate
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Either A or B
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None of the above
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Detailed explanation-1: -The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate. Such factors as stress, caffeine, and excitement may temporarily accelerate your heart rate, while meditating or taking slow, deep breaths may help to slow your heart rate.
Detailed explanation-2: -In the heart, parasympathetic stimulation of M2 receptors causes decreased heart rate and velocity of conduction through the AV node. In the vasculature, parasympathetic stimulation of M3 receptors leads to vasodilation. In the lungs, parasympathetic stimulation of M3 receptors leads to bronchoconstriction.
Detailed explanation-3: -The higher the vagus nerve activity is, the slower the heart rate is, the greater the increase in the parasympathetic component of heart rate variability is, and the better the outcome is.