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</ iframe > </noscript> <!-- End Google Tag Manager (noscript) --><div id="header"> <div id="CClogo"><a href="https://www.cookchildrens.org"><span class="srText">Cook Children's</span></a></div> <div id="CCsearch"> <form id="searchform" name="searchform" method="GET" onsubmit="return (this.q.value == '') ? false : true;" action="/CookChildrens/en/parents/"> <input type="hidden" name="search" value="y"/> <input type="hidden" name="getfields" value="description"/> <input type="search" class="search" name="q" id="q" maxlength="256" autocomplete="off" autocorrect="off" placeholder="Search"/> <input type="hidden" name="datasource" value="cookchildrens"> <input type="hidden" name="start" value="0"> <input type="hidden" name="rows" value="10"> <input type="hidden" name="lang" value="english"> <input type="hidden" name="section" value="parents_teens_kids"> <input type="submit" value="" id="searchButton" class="buttonImage"/> </form> </div> </div> <!-- If we have main navigation separated then it will reside here --> <div id="thelou" tabindex="-1"> </div> <div id="mainContentContainer" class="kh-article-page"> <div id="rsSearchBrowse"> <div id="rsBrowse" role="navigation"> </div> <div id="rsSearch"> <div id="rsSectionLabel">kids</div> </div> </div> <div id="khContentHeading" class="ar licH"> <h1>Movie: Muscular System</h1> </div> <div id="khcontent"> <div id="khcontent_article" style=""><!--googleoff:all--> <div id="languagePairLink" class="rs_skip"><a href="/CookChildrens/es/kids/msmovie.html?WT.ac=pairedLink"><span class="pairedURLHead" lang="es">en español<img src="/images/n00/icons/langPairArrow.svg" alt=""></span><span class="pairedURLBody" lang="es">Video: Músculos</span></a></div> <!--googleon:all--><!--googleon:all--><div class="rte-image"><!--<sly data-sly-test.buttonBorder="khb-noborder"></sly> --><p>If you've ever wondered how your muscles work, this movie has the answer!</p></div><div class="rawhtml"><div class="rs_skip rs_preserve"><!-- TinyMCE Fix --><script src="//familysurvey.org/misc/javascript/js_apps/video/kh-video-metadata.js" type="text/javascript"></script><script src="//familysurvey.org/misc/javascript/js_apps/video/kh-video-controller.js" type="text/javascript"></script><script src="//familysurvey.org/misc/javascript/js_apps/video/single-how-muscles-work-en.js" type="text/javascript"></script></div></div><div class="rte-image"><!--<sly data-sly-test.buttonBorder="khb-noborder"></sly> --><p><a href="/CookChildrens/en/kids/muscles.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwArticle-enBT.png" alt="Muscles Article" name="4549-K_HTBW_ARTICLE_ENBT.PNG" /></a><a href="/CookChildrens/en/kids/msquiz.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwQuiz-enBT.png" alt="Muscles Quiz" name="4550-K_HTBW_QUIZZIES_ENBT.PNG" /></a><a href="/CookChildrens/en/kids/bfs-msactivity.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwActivity-enBT.png" alt="Muscles Activity" name="4551-K_HTBW_ACTIVITIES_ENBT.PNG" /></a><a class="kh_anchor"></a></p><p><a href="/CookChildrens/en/kids/htbw/"><img src="/content/dam/kidshealth/en/buttons/K-htbwSeeAll-enBT.png" alt="See All Parts" name="4570-K_HTBW_SEEALL.PNG" /></a><a href="/CookChildrens/en/kids/bodymovies.html"><img title="View All Movies" src="/content/dam/kidshealth/en/buttons/K-HTBWseeAllMovies-enBT.jpg" alt="View All Movies" name="K-HTBWseeAllMovies-enBT.jpg" /></a></p><p> </p></div><!--googleoff:all--></div> </div> <div id="kh_lic_footer"> <nav aria-label="Content info"> <ul id="kh_lic_footer_links"> <li><a href="/CookChildrens/en/kids/editorial-policy-licensee.html">Editorial Policy</a></li> <li><a href="/CookChildrens/en/kids/policy-licensees.html">Privacy Policy & Terms of Use</a></li> <li><a href="/CookChildrens/en/kids/copyright.html">Copyright</a></li> </ul> </nav> <div id="kh_lic_footer_legalease"> <p><img lang="en" alt="A KidsHealth Education Partner" src="/images/n00/logos/eduPartner3.svg"> Note: All information is for educational purposes only. 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