Muscles are always relaxed

Muscles atrophy when they are exercised frequently

A strain is a sudden, painful involuntary muscle contraction

Moving a body part away from the midline

Straightening a body part

Bending a body part

The ability of muscles to be stretched

The ability of muscles to return to its original shape

Severe tightening of a flexor muscle resulting in the bending of a joint

The basic structure of the nervous system is the _______ or nerve cell

______ are the combination of many nerve fibers located outside the brain and spinal cord

The _____ is a mass of nerve tissue protected by the skull

The membranes covering and protecting the brain and spinal cord

The _______ is located below the back of the cerebrum and coordinates muscle balance and posture

The central nervous system consists of the brain and spinal cord

Cerebrospinal fluid act as a shock absorber