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(Video)</h1> </div> <div id="khcontent"> <div id="khcontent_article" style=""><!--googleoff:all--> <div id="languagePairLink" class="rs_skip"><a href="/CookChildrens/es/kids/ismovie.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: Sistema inmunitario</span></a></div> <!--googleon:all--><!--googleon:all--><div class="rte-image"><!--<sly data-sly-test.buttonBorder="khb-noborder"></sly> --><h3>What Does the Immune System Do?</h3><p>If you've ever wondered how your immune system works, this movie is for you!</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-immune-system-works-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/immune.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwArticle-enBT.png" alt="Immune Article" name="4549-K_HTBW_ARTICLE_ENBT.PNG" /></a><a href="/CookChildrens/en/kids/isquiz.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwQuiz-enBT.png" alt="Immune Quiz" name="4550-K_HTBW_QUIZZIES_ENBT.PNG" /></a><a href="/CookChildrens/en/kids/bfs-isactivity.html"><img src="/content/dam/kidshealth/en/buttons/K-htbwActivity-enBT.png" alt="Immune Activity" name="4551-K_HTBW_ACTIVITIES_ENBT.PNG" /></a><a class="kh_anchor"></a></p><p><a href="/CookChildrens/en/kids/center/htbw-main-page.html"><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="See All Movies" src="/content/dam/kidshealth/en/buttons/K-HTBWseeAllMovies-enBT.jpg" alt="See All Movies" /></a></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">KidsHealth 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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