Question

which type of reflex arc involves an interneuron within the spinal cord?
answers: a - e
a reflex with reciprocal inhibition
b polysynaptic reflex
c somatic reflex
d autonomic reflex
e monosynaptic reflex

Explanation:

A polysynaptic reflex arc has an interneuron within the spinal cord. In contrast, a monosynaptic reflex (E) has no interneuron. A reflex with reciprocal inhibition (A) is a type of polysynaptic reflex but the key feature here is the presence of an interneuron which is characteristic of polysynaptic reflexes. Somatic reflex (C) and autonomic reflex (D) are classifications based on the effector (somatic vs autonomic) rather than the presence of an interneuron. So the answer is B.

Answer:

B. Polysynaptic reflex