Bill Nye the Science Guy
Season 4 Episode 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.
Episodes in Season 4
Rivers & Streams
26 min
Nutrition
26 min
Marine Mammals
26 min
Earthquakes
26 min
NTV Top 11 Video Countdown
26 min
Spiders
26 min
Pollution Solutions
26 min
Probability
26 min
Pseudoscience
26 min
Flowers
26 min
Archaeology
26 min
Deserts
26 min
Amphibians
26 min
Volcanoes
26 min
Invertebrates
26 min
Heart
26 min
Inventions
26 min
Computers
26 min
Fossils
26 min
Time
26 min
