HUMAN BODY

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Your heart is really a muscle. It's located a little to the left of the middle of your chest, and it's about the size of your fist. There are lots of muscles all over your body - in your arms, in your legs, in your back, even in your behind. But this muscle is special because of what it does - the heart sends blood around your body. The blood provides your body with the oxygen and nutrients it needs. It also carries away the waste that your body has to get rid of.

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Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: it receives blood from the lungs and pumps it out to the body. By the time you're grown up, your heart will be beating (pumping) about 70 times a minute.

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How does the heart beat? Before each beat, your heart fills with blood. Then it contracts to squirt the blood along. When something contracts, it squeezes tighter - try squeezing your hand into a fist. That's sort of like what your heart does so it can squirt out the blood. Your heart does this all day and all night, all the time. Every day, an adult heart pumps 2,000 gallons (7,500 liters) of recycled blood by filling and contracting. The heart is one tough worker!

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You do something about twenty times a minute without even thinking about it—you breathe! In fact, every day you take about twenty-thousand breaths.

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Each adult lung is about the size of a football. When they are healthy, your lungs feel a little like a sponge and are pinkish-gray. When lungs are damaged by smoking, they can appear gray or have black spots on them.

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Have you ever watched as your mom or dad pumps gas into your car? You may not realize it, but the most vital part of your body— your heart—is simply a fancy pump.

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Every cell in the body depends on this muscle, the body's hardest-working organ.

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Blood pressure numbers of less than 120/80 mm Hg are considered within the normal range. If your results fall into this category, stick with heart-healthy habits like following a balanced diet and getting regular exercise.

What is the name of the main type of cell found in the brain and its function?

What is a wiring talking about human body?