1
Nerve cells, or _______ are found in the ______ system.
A pair of skeletal muscles work together when one muscle _____ the other relaxes
Contracts
Your spinal cord is part of the _________ system.
Central nervous
The process or breaking down food into a form that cells can use is called
Digestion
Once air enters the body it moves to the ______ to the _____ and next to the _________.
Pharynx, trachea, bronchial tubes.
Tell how skeletal, cardiac, and, smooth muscles differ.
............
The tree kinds of muscles are
cardiac
skeletal
smooth
The esophagus and small intestine are parts of the _____ system.
digestive
Explain how the respiratory and circulatory systems provide oxygen and get rid of carbon dioxide.
............
______ muscles are voluntary
skeletal
Viruses are much ____ than bacteria
Smaller
Describe the path blood through the body.
...........
The _________ system protects your organs and helps you move
skeletal
Messages are sent to different body systems by the ______
Brain