The nose, throat, and lungs are just a few parts of the body that make up the respiratory system. They work together to bring oxygen into the body and take carbon dioxide (a waste product) out.

The male reproductive system is made up of the parts inside and outside a male’s body that help make a baby. Learn about them and how they work.

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 ...

Everybody knows that some organs in the human body are necessary for survival: you need your brain, your heart, your lungs, your kidneys... KIDNEYS? Absolutely. Even though you won't find a ...

The digestive process starts even before the first bite of food. Find out more about the digestive system and how our bodies break down and absorb the food we eat.

Before having sex, it’s important to know about birth control and protecting against unplanned pregnancy and sexually transmitted diseases (STDs).

These bacterial infections can cause diarrhea, cramping, belly pain, and fever. Good hand-washing and food safety habits can help prevent them.

Peptic ulcers are open, painful sores that affect the stomach and the upper part of the small intestine, called the duodenum (doo-uh-DEE-num). Ulcers in the stomach are also called stomach ulcers or ...

Cramps can put a crimp in a girl's daily routine. Find out what period cramps are and how to handle them.

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 ...

A "popped" eardrum is more than just painful - it can sometimes lead to hearing loss. Learn about ruptured eardrums and how to prevent them.

The complete blood count (CBC) is the most common blood test. It analyzes red blood cells, white blood cells, and platelets.