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