| A | B |
|---|
| Sensory Nerve | A nerve containing the axons of sensory neurons only |
| Motor Nerve | A nerve containing the axons of motor neurons only |
| Neurotransmitters | A substance released by the synaptic knob into the synaptic cleft that initiates impulses in adjacent neurons |
| Acetylocholine | A Neurotransmitter |
| Norepinephrine | An excitatory neurotransmitter |
| Nerve Net | An interconnected network of nerve cells through which impulses can travel in any direction |
| Ventral Nerve cord | A large nerve running along the lower portion of the body |
| Regulation | The control and the coordination of all life activity |
