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nervous regulation
vocabulary words
| Term | Definition |
|---|---|
| regulation | controls the amount and the direction of respones |
| irritablity | ability of a cell to respond to its environment |
| impulses | signal that travels along the nerve fiber and ends in the release of neurotransmitters |
| stimulus | causes a change in an environment |
| response | action resulting from the stimulus |
| receptor | specialized structures sensitive to certain types of stimuli |
| neuron | send electrical and chemical impulses |
| effector | body parts that respond to the nervous sysytem command.they can be muslcles or glands. |
| cell body | contains the nucleus and other organelles it is the site for metabolic activities |
| dendrites | hair like structures,which recieves impulses first |
| convulation | uncontrolled actions in the body |
| axon | long thin structures that carries impulses away from the cell body to an effector or neurons |
| reflex arc | impulse pathway |
| cerebrum | it contains memory thought,analyzing and the senses |
| cerebellum | it maintains balance and controls all voluntary and some involuntary movement |
| medulla oblongata | lowest part of the brain that controls many involuntary activities |
| central nervous system | sensory impulses are transmitted and motor impulses pass out |
| peripheral nervous system | all other neurons outside the cns,divided into somatic and automatic nervous system |
| meninges | three membranes that cover the brain and spinal cord |
| neurotransmitters | brain chemical that allow transmission of signals from one neuron to another |