In twitch summation,
a. the muscle fiber is stimulated again before the action potential has returned to resting potential.
b. the muscle fiber is stimulated again before the filaments have completely returned to their resting position.
c. stronger muscle contractions occur but stronger action potentials do not occur.
d. both (b) and (c) above.
e. all of these answers.
D
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Fill in the blank(s) with the appropriate word(s).
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