MUSCLE PHYSIOLOGY

Detailed explanation-1: -Because an action potential generated by a motor neuron normally brings to threshold all of the muscle fibers it contacts, a single motor neuron and its associated muscle fibers together constitute the smallest unit of force that can be activated to produce movement.

Detailed explanation-2: -MUSCLE TWITCH When an action potential travels down the motor neuron, it will result in a contraction of all of the muscle fibers associated with that motor neuron. The contraction generated by a single action potential is called a muscle twitch.

Detailed explanation-3: -When a motor neuron is activated, all of the muscle fibers innervated by the motor neuron are stimulated and contract. The activation of one motor neuron will result in a weak but distributed muscle contraction.