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Psycology Ch 3
deffinitions for chapter three
Word | Deffinition |
---|---|
glia cells | support cells for the neurons. supply nutrients, remove waste products, and help insulate the neuron |
neuron | individual cells in your brain and nervous system that receive, integrate, and transmit |
censory or afferent | receive info from senses, carry it to the brain |
motor or efferent | go to skeletal muscle |
soma | body of a cell |
dendrites | branches that pick uup info and send it to the soma |
axon | fiber which the info is sent from one neuron to another |
myelin sheath | covers the axon |
three most common ions that charge some are? | Sodium, Chloride, Potassium |
action potential | firing of a neuron |
neural threshold | the minimum amount of stimuli required to fire a neuron |
absolute refractory period | the minimum time it takes to recharge a neuron so it can fire again. |
ED50 | Effective dosage at 50% |
LD50 | lethal dosage at fifty percent |
agonist | ingested chemicals that mimic the action of a neuro transmitter (Stimulates) |
antagonist | ingested chemicals that oppose the firing (ex alcohol) |
corpus callosum | C- shaped peice of tissue that lies between your two brain hemispheres that transmits info from one hemisphere to another |