…

The world has now entered the second decade of dealing with acquired immune deficiency syndrome (AIDS). According to the Centers for Disease Control, the AIDS virus was first named in 1982, and the h …

Chances are you or somebody you know had a sore throat recently. Most sore throats are caused by viral infections. But some are caused by bacteria like streptococci. On occasion, sore throats caused b …

Blustery winds whirl around the explorers as they pitch their tents. They've just finished ten hours of sweat-producing activity--skiing and dog sledding in frigid Arctic conditions. But these people …

…

About 12 million Americans have asthma, which means someone you know probably has the disease. Even though it is so common, doctors don't know what causes asthma. They do know it isn't contagious. Ast …

By simply looking at a sample of human blood, it wouldn't seem like anything more than a red liquid. The truth is that blood is a complex fluid made up of many different components, each with a speci …

To supply the calories our bodies need for energy, we must eat food. As food passes through our digestive systems, it is mechanically and chemically broken down into nutrients (amino acids, simple sug …

Inside your bones is a thick mass of cells called bone marrow. Every hour, a small number of stem cells in it create all other kinds of blood cells that exist in your body, including leukocytes, eryt …

Like a house, the human body has a framework. But instead of wood, the body's framework is made of all the bones in our skeletal system. There are long bones (arms and legs), short bones (fingers and …