EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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lowers heart rate
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raises 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: -Sympathetic stimulation increases heart rate and myocardial contractility. During exercise, emotional excitement, or under various pathological conditions (e.g., heart failure)[5], the sympathetic nervous system is activated.
Detailed explanation-2: -The two divisions of the ANS act in opposition and balance with each other; excitation of one division results in a balanced inhibition of the other division. For example, the sympathetic division increases heart rate; the parasympathetic division decreases it.
Detailed explanation-3: -The sympathetic nervous system prepares the body for the “fight or flight” response during any potential danger. On the other hand, the parasympathetic nervous system inhibits the body from overworking and restores the body to a calm and composed state.