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

Question

Quizplus · Accepted Answer

The motor unit in vertebrate skeletal muscle refers to one motor neuron and all of the muscle fibers it innervates. When the motor neuron fires, all of the muscle fibers in that motor unit contract simultaneously. This is important for producing precise movements and strength regulation. The other choices do not accurately describe the motor unit.

The Motor Unit in Vertebrate Skeletal Muscle Refers to ________