The skeletal system/the muscular system. 

 - Chicago :  World Book,  c2007. 
 - 48 p. :  col. ill ;  28 cm. 
 - World Book's human body works .
 - World Book's human body works. .
<br/><br/>Includes bibliographical references (p. 47) and index. 
<br/><br/>Why do we move? -- What gives the body its shape? -- Skull and backbone -- Legs and arms -- Inside a bone -- Blood and bone -- Changing bones -- Connected bones -- More about joints -- Damage and repair -- Turning energy into action -- How do muscles work? -- Striped and smooth -- Ligaments and tendons -- Matching pairs -- Other muscle jobs -- Reflexes -- Balance and coordination -- Exercise -- Slowing down -- Caring for bones and muscles. 
<br/><br/><label>ISBN: </label>0716644266 9780716644262 
<br/><br/><label>LCCN: </label>2006004689 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human skeleton--Juvenile literature.<br/>Musculoskeletal system--Juvenile literature.
<br/><br/><label>LC Class. No.: </label>QM101  / .S54 2007 
<br/><br/><label>Dewey Class. No.: </label>611/.71