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Neurological System Sample Question
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The physiological explanation for syncope is: |
| b. |
Syncope occurs in the presence of diminished venous return and resulting decreased stroke volume. The reduction in stroke volume triggers a sympathetic reaction of cardiac contractility followed by sympathetic withdrawal. The parasympathetic nervous system is then activated, causing vasodilatation, bradycardia, hypotension, and syncope.
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| a. |
accelerated venous return and increased stroke volume resulting in a deactivation of the parasympathetic nervous system. |
| b. |
a cycle of inappropriate vasodilatation, bradycardia, and hypotension. |
| c. |
a sudden rise in blood pressure due to overly efficient vasoconstriction. |
| d. |
emotional stress resulting in hypertension, tachycardia, and increased venous return. |
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