Which of the Following is Not Required for a Withdrawal

Question

Which of the following is not required for a withdrawal reflex?
A) Ascending tract
B) Afferent neuron
C) Efferent neuron
D) Interneuron

Accepted Answer

An ascending tract is not required for a withdrawal reflex as it involves a purely spinal reflex arc. The withdrawal reflex is initiated by the stimulation of nociceptors (pain receptors) in the skin, which activates afferent neurons. The afferent neurons synapse with interneurons in the spinal cord, which activate efferent neurons. The efferent neurons innervate muscles and cause a rapid withdrawal of the stimulated body part from the painful stimulus.