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← Human Body & HealthWhy does blood pressure increase after administering norepinephrine in a trauma patient?
A)Increased parasympathetic nervous activity
B)Norepinephrine-induced vasoconstriction increases TPR✓
C)Decreased baroreceptor firing reduces heart rate
D)Reduced venous return elevates stroke volume
💡 Explanation
Norepinephrine increases blood pressure because it activates alpha-1 adrenergic receptors on blood vessels, resulting in vasoconstriction; this elevates total peripheral resistance (TPR) and blood pressure. Therefore, vasoconstriction causes the pressure increase, rather than parasympathetic effects, reduced heart rate or changes in venous return.
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