Which of these statements describes a motor unit

Question

Quizplus · Accepted Answer

A motor unit refers to a single motor neuron and all the muscle fibres it innervates. When the motor neuron is activated, all the muscle fibres connected to it will contract simultaneously. Therefore, a motor unit is considered the functional unit of skeletal muscle contraction. Option A correctly defines a motor unit. Option B is incorrect because a single muscle fibre is only innervated by one motor neuron. Option C is incorrect because not all the motor neurons supplying a single muscle are considered a motor unit. Option D is incorrect because pairs of antagonistic muscles refer to muscles that exert opposite actions, not a motor unit.

Which of These Statements Describes a Motor Unit