In neurogenic shock:

Rationale: A. In neurogenic shock, sympathetic input is lost, so blood vessels cannot constrict effectively, leading to vasodilation rather than vasoconstriction. B. Neurogenic shock is a type of distributive shock caused by sudden loss of sympathetic tone. The parasympathetic nervous system remains unopposed, resulting in peripheral vasodilation, hypotension, and often bradycardia. Because the vessels are dilated, blood pools in the periphery, reducing venous return to the heart and causing decreased cardiac output. Common causes include spinal cord injury (typically above T6), severe traumatic brain injury, or spinal anesthesia. C. Neurogenic shock is not due to increased sympathetic activity. In fact, it is the loss of sympathetic stimulation that leads to shock. D. The parasympathetic nervous system is not lost; it remains active and unopposed, contributing to bradycardia and vasodilation.