During coactivation

Question

During coactivation

Quizplus · Accepted Answer

Coactivation refers to the simultaneous activation of both gamma motor-neurons and alpha motor-neurons to a skeletal muscle. This results in the contraction of both intrafusal and extrafusal muscle fibers, which helps to maintain muscle tone and stability. Option A is incorrect because not all muscle fibers in a skeletal muscle may be activated simultaneously, as muscles can be activated in a graded manner. Option C is incorrect because cross bridges are not activated simultaneously, rather they cycle on and off during muscle contraction. Option D is incorrect because the activation of primary and secondary endings within a muscle spindle occurs during stretch reflexes, not coactivation.

During Coactivation