Introduction
It is important that we understand how our bodies work so that we will able to take good care of them. All of your body systems have to work together in order to keep you alive. Each of our body systems is interconnected and dependent on each other. Our heart, which is part of our circulatory system, does not beat unless our brain, which is part of our nervous system, tells it to. Our skeletal system is dependent on our digestive system for increase in size and strength. Our muscular system needs our respiratory and circulatory systems to supply energy in the form of oxygen and nutrients. It takes all the systems for human growth and development.