unit 1 Flashcards
(28 cards)
sensory neurons
recieve incoming sensory info-sends to brain
interneurons
carry info betwen neurons
motor neurons
send messages out from brain to muscles/glands
dendrites
recieve info
axon
send electrical messages
myelin sheath
fatty casing on axon
CNS
brain/spinal cord
bodys decison maker
peripheral NS
gathers info and transmitts CNS decisions to body parts
autonomic nervous system
self-regulating–controls glands and muscles (heart)
somatic nervous system
skelatal–controls skeletal muscles
sympathetic nervous system
arouses and expends energy
parasympathetic nervous system
conserves energy as it calms you down
threshold
balance of exitatory and inhibitor signals
resting potential (polarized)
fluid inside is mostly negatively charges with positive Na on the outside
action potential begins
axon membrane is selectively permiable
depolarization ahead of action potential
- action potential opens cell membrane to allow sodium
- inside is now more postive than outside
repolarization
potassium moves out, inside goes back to negative charge
hyperpolarization
voltage below resting potential
agonists
mimic NT for action potential
antagonists
block NT, stops action potential
acetylcholine
muscle contraction
dopamine
pleasure/rewarding sensations
serotonin
mood
norepinephrine
arousal
