The male reproductive system is made up of the parts inside and outside the body that help a male make a baby. Both the male and female reproductive system are needed for this. The male reproductive ...

Allergic reactions can be triggered by foods, medicines, pets, insect stings, pollen, and other things. Most allergic reactions aren't serious. But severe reactions can be life-threatening and need ...

How much do you know about the urinary system, which makes pee? Find out by taking this quiz!

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 ...

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 ...

Sounds are everywhere, and you have two cool parts on your body that let you hear them all: your ears! The outer ear is made up of the pinna — also called the auricle (say: OR-ih-kul) — and the ear ...

Stretch marks are fine lines in the skin that happen when quick growth or weight gain stretches the skin (like during puberty). Skin is usually fairly stretchy, but when it's overstretched, the normal ...

How Does the Digestive System Work? So there you are, sitting at lunch, enjoying some grilled-chicken pizza and a few orange wedges. When you're finished, you take a last drink of milk, wipe your ...

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 ...

When blood glucose levels (called blood sugar levels) drop too low, it's called hypoglycemia. For people with diabetes, hypoglycemia (hi-poe-gly-SEE-me-uh) happens when blood sugar levels fall below ...

If you ever ate so much at Thanksgiving that you felt uncomfortable, you know what it feels like to overeat. It's not unusual to overeat from time to time. Most people do. But binge eating is ...

It's easier to agree than disagree. But we can learn a lot from conversations where we don't see eye to eye — if we can listen and talk rationally, that is. Unfortunately, many us either shy away ...