| A | B |
|---|
| stimulus | any change or sognal in the environment that can make an organism react |
| respones | what your body does in reaction to a stimulus |
| homeostasis | the process by which an organism's internal environment is kept stable in spite of changes in the external environment |
| neuron | cells that carry information through your nervous system |
| nerve impulse | message that a neuron carries |
| cell body | contains the nucleus, dendrites and axon |
| dendrites | carry impulses towards the cell body |
| axon | carries impulses away from the cell body |
| sensory neurons | picks up stimuli from the internal or external environment and converts them into a nerve impulse |
| interneuron | a neuron that carries nerve impulses from one neuron to another |
| motor neuron | sends an impulse to a muscle or gland, and the muscle or gland reacts in response |
| synapse | the junction where one neuron can transfer an impulse to another structure |
| axon tips | release chemicals that carry the impulse across the gap |
| central nervous system | consists of the brain and spinal cord, control center of the body |
| brain | located in the skull, controls most functions in the body |
| spinal cord | thick column of nervous tissue that links the brain to most of the nerves in the peripheral nervous system |
| cerebrum | largest part of the brain,interprets input from the senses, controls movement, learning and remembering |
| cerebellum | coordinates the actions of your muscles and helps with balance |
| brain stem | lies between the cerebellum and spinal cord, controls the body's involuntary actions |
| peripheral nervous system | consists of a network of nerves that branch out from the central nervous system and connect it to the rest of the body, is involved in both voluntary and involuntary actions |
| somatic nervous system | control voluntary actions |
| autonomic nervous system | control involuntary actions |
| reflex | response that happens automatically |
| concussion | bruiselike injury of the brain |
