HISTOLOGY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Heart rate is largely regulated by the autonomic nervous system, which includes two anatomical divisions: the sympathetic and parasympathetic nervous systems (Wehrwein et al., 2016). The sympathetic nervous system increases heart rate, whereas the parasympathetic nervous system suppresses it.
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: -Parasympathetic Stimulation Slows the Heart Rate by Decreasing the Slope of the Pacemaker Potential. Parasympathetic nerves to the heart originate from the vagal motor nuclei in the brainstem and travel over the vagus nerve (cranial nerve X) to the heart.