In a simple reflex action, the impulse from the sensory neuron is processed mainly in the

A reflex arc consists of a receptor, sensory neuron, a relay in the spinal cord, motor neuron and effector. The response is rapid because the impulse does not have to travel to the brain for analysis, as in touching a hot object. The cerebrum controls voluntary action and thought, and the cerebellum maintains balance, while the pituitary is an endocrine gland.