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34 Cards in this Set

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Acetylcholine
one of the main neurotransmitters in the body. (somatic nervous system)
Action potential
a neuron rapidly returns to normal resting state -from tinside, -outside
AUTOnomic nervous system
involuntary sys.
Axon
Part of neuron that conducts signal
Capillaries
merge into veins. branches from arteries. thin cells walled.
central nervous system
Brain & Spinal Chord
Cerebellum
coordinates muscle movement & balance, so its smooth and coordinated
cerebrum
conscious mind. e.g. movement, speech, problem solving
dendrites
part of neuron that cecieves chemical signals
depolarization
when the cell is + inside;
- outside from having Na+ enter
hypothalamus
body homeostasis; eg: hormone levels, temp
interneuron
completely within brain & spinal chord. connect sensory & motor neurons
Dedulla oblongata
INVOLUNTARY acts origninate here eg: breathing, blood pressure
Motor neuron
involved in sending info from the CNS to organs of the body
Myelin sheath
increases speed at which an impulse can travel down an axon because hot all portions of the axon have to fire on action potential.
Na+/K+ ATPase
Protein that pumps 3 Na+ out and 2K+ in
Nerve impulse
traveling action potential
Neuron
nerve cells
Neurotransmitter
chemicals released by neurons
Nodes of Ranvier
spaces between Myelin Sheath which fires action potential
Norepinephrine
one of the main neurotransmitters in the body. used in Sympathetic system.
Parasympathetic division
Most active when at rest. Stimulates digestive system; decreases breathing; decreases blood pressure.
Peripheral Nervous System
Not brain or spinal cord. ex: oragns, skin
Polarized
When a neuron is at rest; inside is - and outside is +
(-70mV)
Refractory Period
ensures that action potential will only travel in one direction
Repolarization
When the membrane potential returns to resting value
Salatory conduction
"Jumping" type of conduction that only occurs in Nodes of Ranvier
Schwann Cells
These cells wrap around the axon (Myelin Sheath)
Sensory Neuron
involved in sending information to CNS from sensory organs of body.
Somatic Nervous System
Voluntary system uses AcH.
Spinal cord
Primarily involved in primitive; reflex actions
Sympathetic division
helps prepare body for stress situations (sweat, blood pressure)
Synapse
Gap between two neurons so the signal jumps to the next neuron/organ
Threshold potential
Voltage-gated channels are opened.