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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, ...

Medically reviewed by: Maureen F. Edelson, MDThis link will open in a new window Learn About Pathology (Lab Services) at Nemours Children's HealthThis link will open in a new window Blood can't be ...

What Is the Digestive System? Food is our fuel, and its nutrients give our bodies' cells the energy and substances they need to work. But before food can do that, it must be digested into small pieces ...

Medically reviewed by: Tal Grunwald, MDThis link will open in a new window Learn About Endocrinology (Hormones & Growth) at Nemours Children's HealthThis link will open in a new window Puberty is the ...

Medically reviewed by: Rupal Christine Gupta, MDThis link will open in a new window Learn About Pediatric Neurology (Brain & Nervous System Care) at Nemours Children's HealthThis link will open in a ...

Learn About Fetal Medicine at Nemours Children's HealthThis link will open in a new window One of the first tests you may have when you’re pregnant is a blood test to check your blood type and Rhesus ...

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 ...

Medically reviewed by: Larissa Hirsch, MDThis link will open in a new window Learn About Primary Care Pediatrics at Nemours Children's HealthThis link will open in a new window Parents can help ...

Medically reviewed by: J. Fernando del Rosario, MDThis link will open in a new window Learn About Gastroenterology (Digestive System Care) at Nemours Children's HealthThis link will open in a new ...

Medically reviewed by: Amy W. Anzilotti, MDThis link will open in a new window Learn About Cardiology (Heart Care) at Nemours Children's HealthThis link will open in a new window A cardiac ...

Sounds are everywhere, and you have two cool parts on your body that let you hear them all: your ears! So how do you hear? Watch this video to step inside an ear.