A genetic condition is one that happens when a gene changes. Some genetic conditions can be inherited (passed from parents to their children). Genes are sections of DNA (deoxyribonucleic acid) that ...

Right ventricle (VEN-trih-kul): one of the four chambers of the heart. The right ventricle pumps blood low in oxygen to the lungs. In the lungs, the blood then gets a "refill" of oxygen.

What Is Hypotonic Cerebral Palsy? Cerebral palsy (CP) affects muscle movement and control. People with CP have it for life. Hypotonic CP is rarer than other types of CP. In rare cases, CP happens ...

Both the brain and the spinal cord are protected by bone: the brain by the bones of the skull, and the spinal cord by vertebrae, a set of ring-shaped bones. They're both cushioned by layers of ...

Sexually transmitted diseases (STDs) are infections spread from person to person during sex (vaginal, oral, or anal) or close sexual contact. STDs are also called sexually transmitted infections, or ...

What Does the Heart & Circulatory System Do? If you've ever wondered how your heart works, this movie has the answer. And special thanks to the Fred J. Brotherton Charitable Foundation for supporting ...

How Does Air Enter the Respiratory System? Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs ...

A parked car in sunny weather is like a greenhouse and heats up very quickly. Even on a mild, sunny day in the 60s, the temperature in a parked car can get dangerously high. Every summer, there are ...

Earaches are common in kids and can have many causes. Here’s why they happen and what to do when your child complains of ear pain. Give acetaminophen or ibuprofen as needed to ease pain (check the ...

How Does the Brain Work? And How Does the Nervous System Work? How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from?

Girls have lots of questions about the body changes of puberty. When will my breasts grow? What's the "normal" age to get your first period? Watch this video and find out!

How Can I Help My Child Manage Anxiety? Feeling nervous, worried, or uneasy at times is a normal part of growing up. Helping your child feel more in control and able to cope with stress can help ...