During coactivation,

Question

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During coactivation, both the gamma motor-neuron and alpha motor-neuron systems to a skeletal muscle are activated simultaneously. This leads to an increase in muscle tension and stiffness. This mechanism is important for maintaining posture and balance, as well as for generating force during voluntary movements. The activation of all muscle fibers in a skeletal muscle simultaneously (option A) or all cross bridges within a single skeletal muscle simultaneously (option C) does not occur during coactivation. The activation of primary and secondary endings within a muscle spindle (option D) occurs during muscle stretch reflexes, not coactivation.

During Coactivation