This main functions of this system are, moving nutrients, oxygen and hormones throughout the body. Which then are transported to the cells which remove waste such as carbon dioxide and nitrogen waste. Overall, the Circulatory System transports blood and oxygen from the lungs to other tissues in the body.
https://www.cliffsnotes.com/study-guides/anatomy-and-physiology/the-cardiovascular-system/functions-of-the-cardiovascular-system