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, ...

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 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 ...

Sore throats are usually caused by viruses. Here's what to do if your child has a sore throat.

Students who require extra help and support might be eligible for special services that provide individualized education programs (IEPs) in public schools, free of charge to families. Understanding ...

Testicular torsion is an emergency condition. It happens when the spermatic cord, which provides blood flow to the testicle, rotates and becomes twisted. The twisting cuts off the testicle's blood ...

If a child with an allergy is exposed to that allergen, their immune system mistakenly believes it's harming their body. It overreacts, treating the substance as an invader and trying to fight it off.

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 ...

What Causes Osgood-Schlatter Disease? Osgood-Schlatter disease happens during the growth spurt of puberty. During a child's growth spurt, the bones, muscles, and tendons grow at different rates. In ...

Parents do everything they can to protect their children. But sadly, many kids have gone through trauma. A trauma is any event that is deeply upsetting, scary, or harmful. Things like abuse, violence, ...

Cystic fibrosis (SIS-tik fye-BROH-sis) is an inherited condition that causes the body to make thick, sticky mucus. The mucus causes problems in the lungs, pancreas, and other organs. People with ...

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 ...