During coactivation
a. all of the muscle fibers in a skeletal muscle are activated simultaneously.
b. the gamma motor-neuron and alpha motor-neuron systems to a skeletal muscle are activated simultaneously.
c. all of the cross bridges within a single skeletal muscle are activated simultaneously.
d. the primary (annulospiral) and secondary (flower-spray) endings within a muscle spindle are activated simultaneously.
e. none of these answers.
B
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