PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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You are working quietly in the library when a friend sneaks up from behind and scares you, making your heart race. At this time, your ____ nervous system would be dominant.
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parasympathetic
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sympathetic
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somatic
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central
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Explanation:
Detailed explanation-1: -The sympathetic nervous system (SNS) has a wide variety of cardiovascular effects, including heart-rate acceleration, increased cardiac contractility, reduced venous capacitance, and peripheral vasoconstriction.
Detailed explanation-2: -Sympathetic Effects The effect on the heart is that the cardiac performance curve becomes more sensitive to changes in the pressure in the right atrium and the upper limit for the cardiac output is set higher (Figure 14). This increased sympathetic activity is associated with a rise in pulse rate.
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