Answer:
Transport of gases and nutrients
Step-by-step explanation:
The circulatory system includes all the vessels that transport blood around the body as well as the blood itself. Sometimes the heart and lungs are also included as part of the circulatory system.
The vessels of the circulatory system are involved in the transport of blood throughout the body. Blood carries the necessary gases to the cells (oxygen) and waste products (CO2) away. It also carries important nutrients to the cells and transports chemical messengers in the form of hormones to their sites of action.