Bill Nye the Science Guy - Season 4 - Eps 16: Heart
Your heart pumps your blood around your body, all hours, every day of the week, to keep you alive. Your heart is about the size of your fist, and it’s made of special muscle called “cardiac” (KAR-dee-ak) muscle. Cardiac muscle lets your heart keep the beat, it can also speed up or slow down, depending on what your body needs. Your heart works like an automatic pump – it squeezes, or contracts, and un-squeezes, or relaxes, to push blood through the four different sections of your heart. Valves, special one-way openings, are like little doors between the sections – making sure your blood moves in only one direction through your heart, to your lungs, back to your heart, and then around your body again.
About Bill Nye the Science Guy

Title: Bill Nye the Science Guy
First Air Date: 1993-09-10
Last Air Date: 1998-06-20
Status: Ended
Rating: 7.2/10 (from 80 votes)
Language: EN
Seasons: 6
Total Episodes: 100
Network: PBS
Genres: Comedy, Documentary, Kids
Production Companies: Rabbit Ears Productions, KCTS Television
Synopsis
It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per show (like the human heart or electricity), Nye gets creative with teaching kids and adults alike the nuances of science.
Cast

Bill Nye
Self - Host

Rachel Glenn
Nancy

Jennifer Lin

Amy Broder
Amy

Ethan Ferkiss
Smell Gibson