Motor units and muscle control

Precise control

-Motor neuron controlling 2-3 muscle fibers

-Ex: control over eye muscles and fingers

Less precise control

-Motor neuron controlling a large amount of muscle fibers, can be around 2000

-Ex: control over the leg muscles and lower back

All or none principle

-Complete/full contraction or no contraction at all

Muscle tone

-The tension of a muscle when it is relaxed

-Stabilizes the position of bones and joints

Muscle hypertrophy

Enlargement of the muscle

Muscle atrophy

Discontinued use of a muscle