Heart to Heart

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HearttoHeart It'sgoingwhetheryou're asleeporawake.Itspeeds upwhenyourunandslows whenyourest.Itisyour heartbeat,anditshowsthat yourheartispumpingblood throughyourbody. Whenyouwereababy,your heartbeatabout130times eachminute. Thatnumberwasyourheart rate. Yourheartratenowisabout 90whenyourest.Asan adult,you'llhavearesting heartrateofbetween70and80. Manyanimalshaveheartsalotlike yours,buttheirheartratescanbe verydifferent.Acat'sheartrateis about120.Themouseit'schasing hasaheartrateof500.A hummingbird'sheartrateis1,200. Biganimalsseemtohaveslower heartrates.Forexample,agray whale'sheartrateisjust9. ™ ©AdvancedAssessmentSystems/LinkIt!Duplicationisrestrictedtolicenseesonly.

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