Cell body 2. Referenced in terms of direction of action potential 3. The junction between one neuron and the next 5. An involuntary response generated by a tap just below the kneecap 2. This tap is sensed by sensory neurons in the leg 3.
Impulse travels to the spinal cord a.
The sensory neuron synapses on a motor neuron and on an inhibitory interneuron 4. Motor neuron goes directly to a muscle that extends the leg 5. This inhibits flexing of this muscle, allowing extension of the leg 6. This is a very simple reflex arc, and it illustrates in general outline how a reflex arc works a. A. Neurons maintain an electrical potential across their membranes, like most cells 1.