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Ability of dendrites/axon to respond to a stimulus and create a nerve impulse (electrical signals)
Resting Membrane Potential
Electrical charge difference across the cell membrane caused by unequal distribution of charged ions
Electrical attraction of unlike charges; Concentration from an area of [high] to are of [low]
Membrane is much more permeable to K+ than to Na+ most reasponsible for (-) RMP
Sodium Potassium Pump
Responsible for establishing the [gradients] for Na+ & K+ and maintaining the (-) RMP
Inside of the cell becomes less (-) relative to the ouside; -70-->-10 cause by increase of Na+ permeability
Synaptic or Graded Potentials
Localized changes in the membrane potential; cause by ions moving through the membrane; decrease in amplitude as they move
Rapid and large depolarization of the neuron membrane; -70mv--> +30mv; results from summation of many synaptic potentials
Theshold (All-or-None Principle)
Smallest depolarization to produce an action potential; Usually -50mv, requiring a depitarization of +20; depolarization LESS THAN threshold= NO AP
Presynaptic Neuron #1
Carries impulses down the axon to the terminals that contain neurotransmitter (i.e. ACh, NE)
Postsynaptic Neuron #2
Receives impulses when NT attach to receptors on dendrites & cell body (soma)
Located inside the base of the skull above the SC; metabolic functions, cardiorespiratory control, some complex reflexes, control of locomotion
Large dome of brain divided into RT & LT hemispheres; organization of complex movement, storage, of learned experiences recieves sensory information
Lies behind the pons & medulla; major coordinator of sensory input & provides feedback regarding motion, controls timing and intensity of muscle activity
Relays information between the CNS & PNS; controls and intergrates simple and complex spinal reflexes
Autonomic Nervous System
Involuntary-PNS; controls the body's internal environment by innervation effector organs (smooth muscle, cardiac glands)
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