Muscle Contraction

The muscle elongates while producing force

The muscle contracts without changing length

The muscle shortens while producing force

The muscle remains relaxed and passive

Triceps brachii

Brachioradialis

Brachialis

Biceps brachii

Autonomic nervous system

Somatic motor nervous system

Central nervous system

Endocrine system

A single muscle fiber

A motor neuron and all the muscle fibers it innervates

A group of motor neurons

A single axon terminal

Latent period, contraction phase, relaxation phase

Initiation phase, action phase, recovery phase

Stimulation phase, active phase, resting phase

Onset period, peak phase, decline phase

Increasing muscle fiber size

Changing the frequency of stimulation and the number of motor units stimulated

Decreasing the number of muscle fibers

Altering the type of muscle fiber

To produce active movement

To keep muscles firm, healthy, and ready to respond

To increase muscle size

To decrease muscle fatigue