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12 Cards in this Set

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the result of unequal Na+ K+ diffusion across the membrane establishes a cells
resting potential
when the cell interior becomes less negatively charged due to an influx of Na+
depolarization
when K+ leaks out of the cell, restoring the cell to its resting potential
repolarization
the rapid depolarization and repolarization of the membrane from the point of stimulation
action potential
a muscle cell is said to be __ when the sodium gates are open and there is no possibility of another response
absolute refractory period
the period after the sodium gates have closed when potassium gates are open and repolarization is ongoing
relative refractory period
a single contraction of skeletal muscle
muscle twitch
three phases of muscle contraction:
latent period, period of contraction, period of relaxation
the staircase phenomenon, shows spikes on a graph of muscle activity
treppe
an increase in the strength of muscle contraction due to an already partial contraction being hit with more stimulus
wave summation
stimulation of skeletal muscle at high frequency will produce a fusion (the steps go away), and a single sustained contraction is achieved
complete/fused tetanus
the loss of the ability to contract
muscle fatigue