Digestive System: The food you eat cannot be used by your body until it is digested, or broken down.
Respiratory System :The respiratory system's job is to take oxygen, which body cells need, and to get rid of carbon dioxide, a waste gas. Muscles help your respiratory system move gasses into your body.
Excretory System: This job is important because it keeps the right amount of water in the body at all times. It also helps keep wastes from building up in the body. These wastes, in large amounts, are harmful.
No comments:
Post a Comment