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 stiff neck without other symptoms is often caused by minor muscle strain from sleeping in an odd position or looking down at a phone too long. This usually gets better with home care. When Should I ...

What Is Developmental Dysplasia of the Hip? Developmental dysplasia of the hip (DDH) is a problem with the way a baby's hip joint forms. Sometimes the condition starts before the baby is born, and ...

What Does the Heart Do? The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After ...

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

What Is a Cardiac Catheterization? A cardiac catheterization is a procedure that cardiologists (heart doctors) do. They put a catheter (a long, thin tube) into a blood vessel, then guide it the heart.

This is a general outline of the milestones on the road to reading success. Keep in mind that kids develop at different paces and spend varying amounts of time at each stage. If you have concerns, ...

Adenoids are a patch of lymphoid tissue that sits at the very back of the nasal passage. Like tonsils, adenoids help keep the body healthy by trapping harmful bacteria and viruses that we breathe in ...

It’s fun to travel. But being away from our usual eating and sleeping routines can make it more likely for someone to get sick. It takes time to adjust to the food, water, and air in a new environment ...

Why Is Hand Washing So Important? It's a message worth repeating — hand washing is by far the best way to keep kids from getting sick and prevent the spread of germs. When kids have contact with germs ...

What Does it Mean to Be Overweight? We see the words "overweight" and "obesity" a lot. Did you know that they have actual medical meanings? Doctors use them to define the amount of extra fat some ...

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 ...