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Your Heart & Circulatory System for Teens
The heart and circulatory system (also called the cardiovascular system) make up the network that delivers blood to the body's tissues.
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Echocardiogram for Teens
An echocardiogram (also called an echo or cardiac ultrasound) uses sound waves to create pictures of the heart. See why doctors might order this test for teens.
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Hypertension (High Blood Pressure) for Teens
High blood pressure, also called hypertension, is more common in adults, but it can happen at any age. Learn what it is and how to treat it.
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Why Exercise Is Wise for Teens
Getting the right amount of exercise can rev up your energy levels and even help you to feel better emotionally. Find out why.
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Blood for Teens
Find out about the mysterious, life-sustaining fluid called blood.
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EKG (Video) for Teens
This video shows what it's like to have an electrocardiogram (EKG for short).
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Cholesterol for Teens
Cholesterol is a type of fat found in your blood. The body needs some cholesterol, but too much can be a problem. Discover more about cholesterol.
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When Being Overweight Is a Health Problem for Teens
A couple of pounds of extra body fat are not a health risk for most people. But when people are severely overweight, it can cause health problems.
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Lyme Disease for Teens
Lyme disease can be treated if it's caught early. Find out what causes it, how it's treated, and how to prevent it.
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Figuring Out Fat and Calories for Teens
From all you hear, you'd think fat and calories are really bad for you, but we all need a certain amount of them in our diets. Find out the truth about fat and calories.