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THE Human BODY

L ungs. L iver. THE Human BODY. B rain. K idney. Inside you there are over 200 bones and more than 600mscles without them, your body would be a shapeless blob. S tomach. Eye. H eart. The lungs. After each pump of your heart, the valves close.

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THE Human BODY

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  1. Lungs Liver THE Human BODY Brain Kidney Inside you there are over 200 bones and more than 600mscles without them, your body would be a shapeless blob. Stomach Eye Heart

  2. The lungs • After each pump of your heart, the valves close. • How well do your lungs function? In other words, how well are you breathing? There are several tests that can help your doctor answer that question. For one of them, called spirometry, you take a breath and then blow the air out as fast and long as you can. These tests can help a doctor find out if someone has asthma.

  3. The liver • Have you ever seen liver and onions on a diner menu? If so, we're guessing you said "yuck" and ordered something else. • But did you know that there's one liver you don't have to order? It's always right inside your abdomen, up under your ribcage, and it's very important to your health. • Your liver is the largest solid organ in your body. By the time you're grown up, it will be about the size of a football. The liver does many jobs, but here are three big ones:

  4. The brain • Your brain contains about 100 billion microscopic cells called neurons—so many it would take you over 3,000 years to count them all. Whenever you dream, laugh, think, see, or move, it’s because tiny chemical and electrical signals are racing between these neurons along billions of tiny neuron highways. Believe it or not, the activity in your brain never stops. Countless messages zip around inside it every second like a supercharged pinball machine. Your neurons create and send more messages than all the phones in the entire world. And while a single neuron generates only a tiny amount of electricity, all your neurons together can generate enough electricity to power a low-wattage bulb. • Brain tells hand to swat fly. Message goes to brain.

  5. The Stomach Everybody knows that some organs in the human body are necessary for survival: you need your brain, your heart, your lungs, your kidneys... KIDNEYS? Absolutely. Even though you won't find a Valentine's Day card with a kidney on the cover, the kidneys are every bit as important as the heart. You need at least one kidney to live! Kidneys normally come in pairs. If you've ever seen a kidney bean, then you have a pretty good idea what the kidneys look like. Each kidney is about 5 inches (about 13 centimeters) long and about 3 inches (about 8 centimeters) wide — about the size of a computer

  6. The Eye • Which part of your body lets you read the back of a cereal box, check out a rainbow, and see a softball heading your way? Which part lets you cry when you're sad and makes tears to protect itself? Which part has muscles that adjust to let you focus on things that are close up or far away? If you guessed the eye, you're right! • Your eyes are at work from the moment you wake up to the moment you close them to go to sleep. They take in tons of information about the world around you — shapes, colours, movements, and more. Then they send the information to your brain for processing so the brain knows what's going on outside of your body. • You can see that the eye's pretty amazing. So, come on — let's take a tour of its many parts. • The Parts of the Eye • You can check out different parts of the eye by looking at your own eye in the mirror or by looking at (but not touching) a friend's eye. Some of the eye's parts are easy to see, so most friends will say OK. Most friends won't say OK if you ask to see their liver!

  7. Heart 2 The left side of the heart gets the blood from the lungs where it has collected oxygen, and pushes it all round the body through the arteries and the tiny blood vessels called capillaries (say cap-il-a-rees). This blood is a bright red colour. The right side of the heart gets the blood after it has taken oxygen round the body and sends it back to the lungs for some more oxygen. This blood is carrying carbon dioxide (say car-bon dye-ox-eye-d), which gets breathed out when it reaches the lungs. This blood looks a darker red colour.

  8. Kidney Everybody knows that some organs in the human body are necessary for survival: you need your brain, your heart, your lungs, your kidneys... KIDNEYS? Absolutely. Even though you won't find a Valentine's Day card with a kidney on the cover, the kidneys are every bit as important as the heart. You need at least one kidney to live! Kidneys normally come in pairs

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