The hard outer layer of the bone is called _____________.

Tendons connect skeletal muscles to ____________.

The nervous system can receive information, process it, and produce a response in less than ___________.

The basic units of the nervous system are ___________.

The __________ system includes the brain, the spinal cord, and nerves.

The _________ carries out many functions that depend on the nervous system.

A __________ movement requires you to think to make them happen.

The ___________ receives and processes reflex signals.

Each of the five senses have specific ________ that receive signals from the environment.

Muscles require calcium for ___________.

The interior region of bone that contains many tiny holes.

The central nervous system is protected by the _________ system.

An _____________ movement does not require you to think about an action to make it happen.

Cardiac muscle is only in the __________.

A __________ is an automatic movement in response to a signal.

A hormone message will take about ___________ to make the trip.