Which of the following is involved in the gradation of muscle contraction?
a. variation in the number of motor units activated
b. variation in the frequency of action potentials initiated in each muscle fiber
c. variation in the size of the action potentials initiated in each muscle fiber
d. both (a) and (b) above.
e. all of these answers.
D
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A. Excitability B. Secretion C. Conductivity D. Permeability
Release of crossbridges and a decline in muscle tension characterize the _______ period of a twitch
A. contraction B. latent C. relaxation
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Answer the following statement true (T) or false (F)
The ________ is the liquid portion of the cell between the plasma membrane and nucleus.
A. peroxisome B. phospholipids C. cytosol D. cytoskeleton