MUSCLE
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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SA node
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AV node
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Atria
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Ventricles
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strellate ganglion
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Detailed explanation-1: -As part of the “fight-versus-flight” response, the sympathetic nerves innervate the heart, blood vessels, bronchi, and GI tract. Sympathetic neurons have short preganglionic fibers that synapse at ganglia (celiac, superior mesenteric, inferior mesenteric, and hypogastric) outside the GI tract.
Detailed explanation-2: -In addition, sympathetic nerves innervate atrial and ventricular cardiomyocytes and can thereby influence force of contraction (inotropy) and relaxation (lusitropy).
Detailed explanation-3: -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.