PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The sympathetic nervous system has what effect on heart rate?
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Slows it down
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Speeds it up
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Maintains it
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None of the above
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Explanation:
Detailed explanation-1: -The sympathetic nervous system releases norepinephrine (NE) while the parasympathetic nervous system releases acetylcholine (ACh). Sympathetic stimulation increases heart rate and myocardial contractility.
Detailed explanation-2: -It is a component of the autonomic nervous system. It controls and regulates various involuntary actions in our body. It causes the heart beat to accelerate.
Detailed explanation-3: -The sympathetic nervous system becomes overactive in a number of diseases, according to a review in the journal Autonomic Neuroscience (opens in new tab). These include cardiovascular diseases like ischemic heart disease, chronic heart failure and hypertension.
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