| A | B |
|---|
| stimulus | change in the environment |
| neuron | nerve cell-basic unit of structure & function |
| cell body | largest part of neuron that contains nucleus |
| dendrites | branching thread-like structures that carry messages to cell body |
| axon | tail-like fiber that carries messages away from cell body |
| axon terminals | pass on messages to dendrites of other neurons |
| receptor | receives information from environment, sends to brain through spinal cord |
| effector | cell that is stimulated by a motor neuron |
| sensory neurons | carry messages from receptors to central nervous system |
| motor neurons | carry messages from central nervous system to effectors |
| interneurons | connect sensory and motor neurons |
| nerve impulse | electrical & chemical message carried throughout body by nerve cells |
| one way nerve impulses travel | electrical & chemical signals along a neuron |
| another way nerve impulses travel | impulse enters neuron through dendrites, travel axon then terminals |
| central nervous system | brain & spinal cord, control center of body` |
| peripheral nervous system | nerves that CNS to other body parts |
| cerebrum | controls thought, speech, memory, voluntary muscles, senses |
| cerebellum | controls balance and posture |
| medulla | automatic body processes (heartbeat, breathing, BP) |
| reflex | automatic & very fast reaction to stimulus |
| autonomic nervous system | controls body activities that happen automatically (heart, digestion) |
