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 ...

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 ...

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?

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, ...

If you decide to have sex, it’s important to know about birth control so you can protect against unplanned pregnancy and sexually transmitted diseases (STDs). STDs are infections that can spread can ...

To help your child get ready for a blood test, find out if they need to fast (not eat or drink) or should stop taking medicines before the test. Explain what to expect during the test. If your child ...

What should you expect as your child grows? Learn how to understand and deal with your child's changing body and mind from infancy through the teen years.

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 ...

Coughing is a healthy reflex that helps clear the airways. A severe cough or one that lasts more than a week requires a medical checkup. But many coughs are caused by a virus that just needs to run ...

What Are the Benefits of Reading to My Toddler? Kids who hear a lot of language do better in school. And being read to is one of the best ways to hear language. Reading to toddlers sets the foundation ...

Fainting (or "passing out") is a temporary loss of consciousness that usually happens because not enough blood is going to the brain due to a drop in blood pressure. Blood pressure can drop from ...