How Animals Mechanically Break Down Food

Different groups of animals eat different foods, but what do animals physically do with the food they consume? The different methods of breaking down food all make up [more…]

Understanding How Animals Breathe

Breathing is the physical action of taking air in to the system and releasing gaseous waste. Respiration is the entire process of taking air in to the system, exchanging needed gases for unnecessary gases [more…]

How Does the Human Digestive System Work?

The human digestive system breaks down the food you consume, using as much of the nutrients as possible to fuel the body. After the energy is extracted from food through digestion and metabolism, the remainder [more…]

How Animals Absorb Nutrients and Dispose of the Rest

Nutrients that the body can use are absorbed into the cells lining the small intestine. The rest of the material that cannot be further digested or used passes onto the large intestine. [more…]

How Blood Flows through the Human Heart

Human hearts, as well as the hearts and circulatory systems of some other mammals, are complex. They need to have a higher blood pressure to get the blood circulated throughout their entire bodies. [more…]

How Blood Clots Form to Prevent Leaking

Blood clots form to help prevent leaking when you break the surface of the skin — for example, when you cut your finger chopping carrots or on a piece of broken glass. Your body goes through a certain [more…]

How Living Organisms Deal with Gases

Elements and gases are part of every living organism on earth. Life on earth began with elements and gases. Plants and animals formed from cells using those materials when the earth was forming. You can [more…]

How a Human Kidney Works

In humans, the kidneys are the organs that produce urine. There are two kidneys, one on each side of your back, just below the ribs. Like most organs in the body, the function of the kidneys is closely [more…]