What Is the Respiratory System? When we breathe, the respiratory system takes in oxygen and sends out carbon dioxide. The cells in our bodies need fresh oxygen to stay alive. As cells do their jobs, ...

The male reproductive system is made up of the parts inside and outside the body that help a male make a baby. Both the male and female reproductive system are needed for this. The male reproductive ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

All-terrain vehicles, or ATVs, are off-road vehicles used for things like farm work and riding on trails. In most states, it's legal for teens to ride them, even without a driver's license. But with ...

Most of us know that some teens cut. But cutting — using a sharp object like a razorblade, knife, or scissors to make marks, cuts, or scratches on one's own body — is just one form of self-injury.

Testicular torsion is an emergency condition. It happens when the spermatic cord, which provides blood flow to the testicle, rotates and becomes twisted. The twisting cuts off the testicle's blood ...

It's easier to agree than disagree. But we can learn a lot from conversations where we don't see eye to eye — if we can listen and talk rationally, that is. Unfortunately, many us either shy away ...

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?

Doctors use certain milestones to tell if a toddler is developing as expected. There's a wide range of what's considered normal, so some children may gain skills earlier or later than others. Toddlers ...

Gynecology ("gyn" for short) is a medical field that focuses on the female reproductive system. A gyn checkup is a yearly health check — like a regular eye exam or dental checkup. Doctors often call ...

Who Do Some Kids Bang Their Head? Head banging can be upsetting for parents to see. But in most cases, occasional head banging is a form of self-stimulation, self-comfort, or a way to release ...

Every single person has a skeleton made up of many bones. These bones give your body structure, let you move in many ways, protect your internal organs, and more. It's time to look at all your bones — ...