Reflexes,controlled by the spinal cord,act by
A)sensory output over cranial nerves to effectors.
B)motor input to reflex centers in the spinal cord.
C)sensory input to reflex centers in the brain.
D)motor output over spinal nerves to effectors.
E)sensory input over cranial nerves to the spinal cord.

Question

Quizplus · Accepted Answer

Reflexes are controlled by the spinal cord, which receives sensory input and sends out motor output over spinal nerves to effectors, without involving the brain. Therefore, option D is the best choice. Options A and E involve cranial nerves, which are part of the peripheral nervous system and not directly involved in spinal reflexes. Option B is incorrect because reflex centers are located within the spinal cord itself, not external to it. Option C is incorrect because the brain is not involved in spinal reflexes.

Reflexes,controlled by the Spinal Cord,act by