What Happens During Coactivation

Multiple Choice

What happens during coactivation?

A) All of the muscle fibres 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.