| A | B |
|---|
| Clusters of nerve cells | Ganglia |
| The body's main control center; the brain and spinal cord | Central Nervous System |
| A network of nerves that extend | Peripheral Nervous System |
| A cell that can conduct nerve impulses through the body | Neurons |
| A nonconducting cell of the nervous system that protect, mechanically support, and assist the neurons | Glial Cells |
| the electrical charge across the cell membrane of a neuron in the resting state | Resting Potential |
| A depolarization followed a re-polarization across the membrane of a neuron | Action Potential |
| A tiny gap between adjacent neurons and between neurons and effectors | Synapses |
| A neuron that recieves impulses from the environment and relays these messages towards the central nervous system | Sensory Neurons |
| A neuron that conducts impulses away from the central nervous system and towards the cells involved in the response | Motor Neurons |
| A neuron that conducts impulses within the central nervous system | Interneurons |
| The pathway of neurons that carries the nerve impulses for automatic, involuntary response to a stimulus | Reflex Arc |
| The part of the brain that connects the spinal cord to the rest of the brain | Brain Stem |
| The second largest part of the brain; coordinates muscle activity | Cerebellum |
| The largest region of the human brain. Responsible for all conscious, or vocabulary, activity | Cerebrum |
| A division of the peripheral nervous system that controls voluntary rsponse | Somatic Nervous System |
| A division of the peripheral nervous system that controls the activities of smooth muscles, organs and glands | Autonomic Nervous System |
| A divison of the nervous system that controls the body's response to stressful situations | Sympathetic Nervous System |
| A division of the autonomic nervous system that controls body functions associated with rest and digestion | Parasympathetic Nervous System |
| The part of the eye that contains photo-receptors | Retina |
| The fluid-filled structure of the inner ear that contains the mechanoreceptors needed for hearing | Cochlea |
| A brain injury caused by a blow to the head | Concussion |
| A disease that causes the deterioration of the brain | Alzheimer's Disease |
| An environmental condition to which an organism responds | Stimulants |
| A drug that shows the activity of the central nervous system | Depressants |
| A drug that affects the sensory perceptiona of the central nervous system | hallucinogens |
| Ant drug tat relieves pain or induces sleep | Narotics |
