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nervous system
ch 35
| Term | Definition |
|---|---|
| epithelial tissue | tissue that covers the interior and exterior body surfaces |
| connective tissue | provides support for the body and connects parts |
| nervous tissue | transmits nerve impulses throughout the body |
| muscle tissue | enables the body to move |
| homeostasis | the process organisms do to keep internal conditions constant despite external conditions "keeping things in balance" |
| feedback inhibition (negative feedback) | process in which a stimulus produces a response that opposes the original stimulus |
| neuron | cells that transmit impulses (electrical signal) |
| cell body | contains nucleus and cytoplasm, where metabolic activity occurs |
| dendrite | extends from cell body, short branched extensions |
| axon | a fiber that carries impulses away from cell body, ends with terminals |
| myelin sheath | insulating membrane on axon |
| resting potential | electric charge on both sides of cell membrane + charge on outside, -charge on inside |
| action potential | + charge on inside, -charge on outside aka: nerve impulse |
| threshold | minimum level of stimulus needed to activate the neuron |
| synapse | the location where an impulse can be transferred to another dendrite |
| neurotransmitter | chemicals used to transmit an impulse across the synapse to the next cell |
| sensory neuron | carry impulse from sense organ to spinal cord and brain |
| motor neuron | carry impulse from brain and spinal cord to muscles and glands |
| interneuron | connects and carries impulses between sensory neurons and motor neurons |
| reflex arc | the pathway an impulse travels |
Created by:
rwardAHS
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