A&p Lab Chapter 16

Front 1

the result of unequal Na+ K+ diffusion across the membrane establishes a cells

Back 1

resting potential

Front 2

when the cell interior becomes less negatively charged due to an influx of Na+

Back 2

depolarization

Front 3

when K+ leaks out of the cell, restoring the cell to its resting potential

Back 3

repolarization

Front 4

the rapid depolarization and repolarization of the membrane from the point of stimulation

Back 4

action potential

Front 5

a muscle cell is said to be __ when the sodium gates are open and there is no possibility of another response

Back 5

absolute refractory period

Front 6

the period after the sodium gates have closed when potassium gates are open and repolarization is ongoing

Back 6

relative refractory period

Front 7

a single contraction of skeletal muscle

Back 7

muscle twitch

Front 8

three phases of muscle contraction:

Back 8

latent period, period of contraction, period of relaxation

Front 9

the staircase phenomenon, shows spikes on a graph of muscle activity

Back 9

treppe

Front 10

an increase in the strength of muscle contraction due to an already partial contraction being hit with more stimulus

Back 10

wave summation

Front 11

stimulation of skeletal muscle at high frequency will produce a fusion (the steps go away), and a single sustained contraction is achieved

Back 11

complete/fused tetanus

Front 12

the loss of the ability to contract

Back 12

muscle fatigue