The body is composed of different organ systems which include cardiovascular system, digestive or gastrointestinal system, musculoskeletal system, nervous system, respiratory system, urinary system and reproductive system among others. Each of this system has their own functions. For example, the function of the cardiovascular system is to pump and circulate the blood all over the body. The organs which compose this system are the heart and the blood vessels specifically the arteries, veins and capillaries. On the other hand, the function of the digestive or gastrointestinal system is to receive and digest and excrete waste. This system includes the mouth esophagus, stomach, small and large intestine, rectum, anus, liver, gallbladder, pancreas and appendix.
   
Although each of the organ systems in the body has their own specific functions, they all work together and are dependent on one another.  Take the skeletal system for example. This system provides the framework for the body and protects our internal organs. Through this system, we are able to move and it also stores minerals for the bodys future use such as calcium and phosphorus.
   
The skeletal system interacts with the nervous system. First, the mineral calcium which is stored in the bones is vital in the functioning of the nervous system. The skull and the vertebrae which are part of the skeletal system protect organs of the nervous system, the brain and the spinal cord. Furthermore, the signals about body positioning are sent to the brain by the sensory receptors in joints between the bones. On the other hand, the nervous system regulates body positioning by controlling the muscles.
According to Beers (2006) communication between organs and organ systems is vital. It is through communication that body adjusts to the each organs function according to the needs of the whole body. As an example, our heart must know when the body is resting so that it can slow down and when organs need more blood so that it can speed up.

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