Why Cancer is Dangerous ?

Lung Cancer

When cancerous cells multiply, they form clumps called tumors. Tumors can interfere with important body processes. Cancer of the lungs, for instance, interferes with breathing. Cancer of the stomach interferes with digesting food.

Cancerous cells can also spread to other parts of the body. Then new tumors form. This spreading is called metastasis. Cancer that has metastasized is the most dangerous. When cancer attacks several parts of the body, it is hard to stop.

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What is Cancer ?

LUNG CANCER

Cancer—it’s scary word, and a scary disease. Cancer kills a lot of people all over the world. Only heart disease kills more Americans.

But there’s good news too. Millions of people who have had cancer are still alive. Doctors have learned a great deal about treating and preventing cancer.

What is Cancer ?

Cancer can attack any part of the body, including the lungs, shown here. Normal lung tissue is light pink in color, but cancerous lung tissue caused by smoking turns black.

Cancer is not a single disease. It includes more than 100 different diseases. They may affect any part of the body. But they have one thing in common. They are all caused by cells that are out of control.

All living things are made up of cells. An adult human body has about 30 trillion cells—that’s 30,000,000,000,000! Cells reproduce (make more cells) by dividing in half. In an adult body, about 25 million cells divide every second. That’s how the body heals itself.

Sometimes a cell goes out of control and divides over and over. And that’s what cancer is—unhealthy cells, growing and reproducing out of control. These cells are said to be cancerous.
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What Do Bones Do ?

Squeeze your arm. The outside of your arm is soft, but there is a hard part inside. The hard part is a bone. There are bones in your arms and in your legs. Bones go up the middle of your back. They go around your chest. All of your bones together make up your skeleton. Your skeleton holds your body up.It gives your body its shape. Bones do many other important jobs in your body.

WHAT DO BONES DO?

Your body contains 206 bones of various shapes and sizes. Bones protect your internal organs and support your body as you stand, sit, walk, and run.

Many bones protect the soft parts inside your body. Skull bones around your head protect your brain. Rib bones make a cage around your chest. Your rib cage protects your lungs and heart.

Muscles hook on to bones. Muscles pull on your bones to make them move. Muscles and bones together let you stand, sit, and walk around.

Blood is made in the center of bones. The center of a bone is filled with bone marrow. Bone marrow is soft. Red and white blood cells are made by bone marrow. Red blood cells carry oxygen to all parts of your body. White blood cells help your body fight germs.

Three tiny bones help you hear. The three bones are deep inside your ears. One of these bones is called the stirrup bone. It is the smallest bone in your body.
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