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  • [MUSIC PLAYING]

  • KidsHealth presents "How the Body Works,"

  • with Chloe and the Nurb.

  • And then, the gall bladder stands up and finishes my joke.

  • I mean, the gall of that guy.

  • Hold that thought, Nurb.

  • What's this?

  • Hmm, 5th Annual Bodylandia Lung Race.

  • The duo that gets into and then out of the lungs

  • first wins a prize.

  • A prize?

  • A prize, Chloe.

  • Oh my dear heavens, a prize!

  • Hmm, if the time on this poster is right,

  • the race is about to start any minute.

  • Yikes!

  • We better get into our running outfits.

  • The Nurb is always ready for a race.

  • Chloe is too.

  • To the racetrack.

  • [MARIO CART THEME MUSIC]

  • Phew, made it in the nick of time.

  • They're about to start.

  • [SNEEZE]

  • And they're off.

  • The kidneys are in the lead, followed

  • by the eyeballs and the ears.

  • Chloe and the Nurb are in dead last.

  • Chloe, let's pick up the pace, shall we?

  • This isn't working.

  • And I'm breathing really hard.

  • You're breathing hard, because your body

  • needs more oxygen. Oxygen is in the air we breathe.

  • When you're breathing hard, your lungs can take in more oxygen,

  • and your heart is beating faster to get that oxygen

  • all around your body.

  • In we go!

  • Do you know where we're going?

  • Of course!

  • Into the respiratory system, and more specifically, the lungs.

  • Ugh, this is gross, Nurb.

  • There are boogers everywhere.

  • Let's get out of here, Chloe.

  • When you inhale, hair comes into your nose or mouth

  • and then down your windpipe, also called the trachea.

  • At the end of the trachea are two large tubes

  • called the bronchi.

  • They lead to two large organs, responsible for breathing,

  • called lungs.

  • One bronchus goes to the left lung, and the other one,

  • to the right.

  • The lungs inhale air with the help from your chest muscles

  • and diaphragm, a dome-shaped muscle under the lungs.

  • As you breathe in, your diaphragm

  • contracts and flattens out.

  • This allows it to move down, so your lungs

  • have more room to expand as they fill up with air.

  • So when you exhale, everything happens in reverse,

  • and the air goes out the way it came in?

  • Exactly.

  • Here we come!

  • This is the lungs?

  • Nurb, it's just another set of tubes.

  • The lungs have tons of these smaller and smaller

  • sized tubes, called bronchioles, which

  • can be as small as the thickness of a hair.

  • The end should be right after the next one.

  • Here we come!

  • Nurb, where are we?

  • The alveoli.

  • Fancy word!

  • This is where the magic happens, where

  • oxygen from the air we breathe gets absorbed into the blood.

  • Alveoli are tiny air sacs at the end of each bronchial.

  • There are about 600 million alveoli in the lungs.

  • Each has a mesh-like covering of very small blood vessels called

  • capillaries.

  • Oxygen travels into the blood through the alveoli

  • into the tiny capillaries that surround them.

  • Fantastic

  • All right.

  • We've got a race to win.

  • But before we go, I should explain

  • the process of exhaling.

  • The air you breathe in is different than the air

  • you breathe out.

  • The most important gas in the air

  • is oxygen. Every one of your body's cells

  • needs oxygen to stay alive.

  • Deep inside the lungs, your body takes oxygen from the air

  • and delivers it to the bloodstream.

  • Then your heart can pump oxygen-rich blood

  • all around the body.

  • Then, the process operates in reverse,

  • letting your body get rid of a gas called

  • carbon dioxide, which is waste gas the body doesn't need.

  • Carbon dioxide is carried by the bloodstream through the lungs,

  • then the lungs exhale it out of the body.

  • Nurb, we're falling further and further behind in the race.

  • No worries!

  • I'll kick it into Nurb hyper drive!

  • We're doing it!

  • We're winning!

  • We're Nurbing now!

  • We did it!

  • We won!

  • The crowd goes wild!

  • Why is everyone so quiet?

  • Uh, Nurb, we won the race like 45 minutes ago.

  • Oh.

  • [MUSIC PLAYING]

[MUSIC PLAYING]

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