circulation in the circulatory system transports blood throughout the body & blood is a vehicle for carrying oxygen from the lungs to the cells / rest of the body ->  the circulation of blood transports oxygen throughout the body  the circulation of blood transports oxygen throughout the body & red blood cells are a part of blood ->  red blood cells carry oxygen throughout the body  red blood cells carry oxygen throughout the body & a bone is a part of a body ->  red blood cells carry oxygen to the bones of the body  red blood cells are a part of blood & blood is a part of the circulatory system ->  red blood cells are a part of the circulatory system  red blood cells are a part of the circulatory system & skeletal system is made of bones ->  red blood cells are a part of the circulatory system and bones are a part of the skeletal system  red blood cells carry oxygen to the bones of the body & red blood cells are a part of the circulatory system and bones are a part of the skeletal system ->  the red blood cells of the circulatory system carry oxygen to the bones of the skeletal system  the red blood cells of the circulatory system carry oxygen to the bones of the skeletal system & if a part of one system carries something to a part of another system, then those two systems are interacting -> an example of the skeletal system interacting with the circulatory system is red blood cells carrying oxygen to the bones