The temporomandibular joint (TMJ) connects the lower jaw to the skull. You can feel your two TM joints and their movement by placing your fingers directly in front of your ears and opening your mouth.

From enjoying the great outdoors to playing sports safely, here's how to protect yourself and deal with emergencies.

Sometimes you need help to stay healthy! Learn about going to the hospital, what a dentist does, how stitches help, and more.

What Is the Digestive System? The digestive system breaks down the food we eat into tiny parts to give us fuel and the nutrients we need to live. As food breaks down, we get amino acids from protein, ...

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, ...

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 ...

The foods we eat contain nutrients that provide energy and other substances the body needs. Most of the nutrients in food fall into three major groups: proteins, fats, and carbohydrates. The body uses ...

The roller coaster hesitates for a split second at the peak of its steep track after a long, slow climb. You know what's about to happen — and there's no way to avoid it now. It's time to hang onto ...

It's no surprise that parents might need some help understanding what it means to eat healthy. From the MyPlate food guide to the latest food fad, it can be awfully confusing. The good news is that ...

Usually, diaper rash is the result of an irritation, infection, or allergy. Also, starting new foods can change the content and frequency of a baby's poop, which can sometimes lead to a diaper rash.

Alpha thalassemia is an inherited blood disorder in which the body doesn't make as much alpha globin. Alpha globin is a building block of hemoglobin. Hemoglobin is the part of red blood cell (RBC) ...

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?