The human body is composed of many parts. All these parts are essential for normal operation. Some parts of the body are more essential than others. For example, the brain is a vital organ that sends the signal of functioning to the rest of the body. The brain is in the head. The heart is another vital organ of the utmost importance. The heart is the main organ of the circulatory system. The heart is like a pump that sends blood to the whole body. The stomach is part of the digestive system. If we do not take care of our food we can suffer infections of the stomach. Other parts of the body that are also very important but not as essential as those mentioned above are the arms, legs, knees, elbows and hands. These parts of the body facilitate movement and help us develop in daily activities at school and in sports.