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, ...

Kawasaki disease is an illness that causes inflammation (swelling and redness) in blood vessels throughout the body. It happens in three phases, and a lasting fever usually is the first sign. The ...

What Are Middle Ear Infections? Ear infections happen when viruses or bacteria get into the middle ear, the space behind the eardrum. When a child has an ear infection (also called otitis media), the ...

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 ...

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not ...

Vaping is the inhaling of an aerosol (mist) created by an electronic cigarette (e-cigarette) or other vaping device. E-cigarettes (often called vape pens) are battery-operated vaping devices that heat ...

Babies are born with newborn reflexes. These are involuntary movements that are a normal part of infant development. For example, if you put your finger in your newborn's hand, the baby will take hold ...

How Does the Skin Work? What Does Skin Do? You couldn't live without the skin you're in. Find out what's going on under the surface in the skin video.

Everybody feels stressed at times — even kids. When you feel stressed, there are things you can do to help yourself through it. Here are some of them. Talk about a problem. If you’re stressed over a ...

Homework takes time. But it doesn’t have to take too much time. You want time to play, relax, and do other things, too. If you learn how to get organized and get focused, then you can get it done in a ...

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, ...

Your eyes see, but how does vision happen? Find out how the eyes and brain work together in this eye video.