The "motor unit" in vertebrate skeletal muscle refers to
A) one actin binding site and its myosin partner.
B) one sarcomere and all of its actin and myosin filaments.
C) one myofibril and all of its sarcomeres.
D) one motor neuron and all of the muscle fibers on which it has synapses.
E) an entire muscle.

Question

Quizplus · Accepted Answer

The motor unit refers to one motor neuron and all of the muscle fibers it innervates or connects with. This means that when the motor neuron sends a signal, all of the muscle fibers in that motor unit will be activated to contract together.

The "Motor Unit" in Vertebrate Skeletal Muscle Refers to