<P> With the exception of the anterior part of the sac from which the cisterna chyli develops, all lymph sacs become invaded by mesenchymal cells and are converted into groups of lymph nodes . </P> <P> The spleen develops from mesenchymal cells between layers of the dorsal mesentery of the stomach . The thymus arises as an outgrowth of the third pharyngeal pouch . </P> <P> The lymphatic system has multiple interrelated functions: </P> <Ul> <Li> It is responsible for the removal of interstitial fluid from tissues </Li> <Li> It absorbs and transports fatty acids and fats as chyle from the digestive system </Li> <Li> It transports white blood cells to and from the lymph nodes into the bones </Li> <Li> The lymph transports antigen - presenting cells, such as dendritic cells, to the lymph nodes where an immune response is stimulated . </Li> </Ul>

What body system is the red blood cell part of what is the main job of that body system