The "Motor Unit" in Vertebrate Skeletal Muscle Refers To

Question

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 fibres on which it has synapses.
E)an entire muscle.

Accepted Answer

The "motor unit" refers to one motor neuron and all of the muscle fibers it innervates. When the motor neuron is activated, all of the muscle fibers it innervates contract together. This allows for coordinated and precise control of muscle movements.