| A | B |
|---|
| neurons | the basic units of the nervous system; carry nerve impulses |
| central nervous system | includes the brain and the spinal cord |
| peripheral nervous system | includes the nerves and senses |
| brain | the organ responsible for processing, learning, and memory |
| spinal cord | a tightly wrapped bundle of nerves that is encased by the vertebral column |
| sensory-neurons | the type of neuron that carries information gathered by the senses to the brain |
| motor-neurons | the type of neurons that carry responses away from the brain |
| hemispheres | the brains is divided into 2 of these |
| lobes | the brain contains four of these |
| cerebrum | the largest part of the brain; does the thinking, learning, and memory |
| cerebellum | the part of the brain involved in movement |
| brain stem | controls all your unconscious functions like heartbeat, breathing, hormone release |
| axon | the part of the neuron that carries the impulse away from the cell body |
| dendrites | the antennae of the neuron; receives impulses from nearby neurons |
| myelin sheath | the layer of insulation on the axons of neurons |
| synapse | the area where neurons are very close to each other; |
| nodes | the spots where the myelin sheath is very thin |
| neurotransmitters | chemicals that can transmit a signal across the synaptic cleft: dopamine & adrenaline |
