The reflex arc is of utmost importance to human beings. Which of the following is NOT a component of the reflex arc?

Options

A. synapse
B. medulla
C. ventral horn cell (effector)
D. ventral hom cell (effector)

Answer

B

Explanation

Reception via afferent (sensory) receptors, conduction via sensory fibers to the central nervous system (spinal cord ) , and propagation of the impulses to the efferent (motor) system will then result in appropriate action. Usually most reflex arcs include one association neuron in the spiral cord between their afferent and efferent fibers. The medulla is not a part of the spinal cord , it is a part of the brain, and usually reflex arcs do not utilize higher centers.