In the withdrawal reflex,
A) action potentials in a pain sensory neuron enter the spinal cord through the ventral root on the same side of the body.
B) the axon from a pain sensory neuron makes inhibitory synapses with motor neurons on the same side of the spinal cord and inhibitory synapses with motor neurons on the other side of the spinal cord.
C) coordinated escape reactions can be initiated before the brain registers the painful sensation.
D) axons from the pain sensory neuron make synapses with sympathetic preganglionic neurons in the spinal cord.
E) axons from motor neurons on the same side of the spinal cord that receives the input from the pain receptors cross the spinal cord to stimulate muscles on the other side of the body.

Question

Quizplus · Accepted Answer

The withdrawal reflex is a rapid, automatic response to a painful stimulus. Action potentials in the pain sensory neuron enter the spinal cord through the dorsal root on the same side of the body, synapse with interneurons, and activate motor neurons that stimulate muscles to withdraw the body part from the source of the pain. Coordinated escape reactions can be initiated before the brain registers the painful sensation, which is why it is considered a reflex. Choices A, B, D, and E are incorrect because they do not accurately describe the withdrawal reflex.

In the Withdrawal Reflex