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.

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 ...

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, ...

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 — ...

What Are the Lungs and Respiratory System? The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out ...

You can't control what other drivers do. But you can do things to lower your chances of being in a crash. This is what it means to be a defensive driver. Before you get behind the wheel, get into the ...

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 ...

What Is Coarctation of the Aorta? Coarctation of the aorta (COA) is a narrowing of the aorta, the major blood vessel that carries blood away from the heart to the body. This narrowing causes the left ...

Slow, calm, deep breathing can help us relax, manage stress, relieve anxiety and depression, and get a good night's sleep, among many other things. Breathing also helps quiet the mind in preparation ...

Sounds are everywhere, and you have two cool parts on your body that let you hear them all: your ears! The outer ear is made up of the pinna — also called the auricle (say: OR-ih-kul) — and the ear ...

How Can We Prevent Fires? Always be aware of possible fire hazards in your house or apartment. To prevent fires, keep these tips in mind: According to the National Fire Prevention Association (NFPA), ...

What Is Mitral Valve Prolapse? Mitral valve prolapse is a common heart condition. It happens when there’s a problem with how one of the heart's valves works. Heart valves keep blood moving through the ...