Which of the following characteristics associated with twitch summation allows for maximal contraction force?
a. high levels of NE in the synapse
b. lower frequency of action potentials in the sarcolemma
c. increased movement of calcium into the sarcoplasmic reticulum
d. rapid rise of calcium in the cytosol
e. longer latent periods of contractions
D
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Fill in the blank(s) with the appropriate word(s).
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