Main Functions Transport of nutrients and oxygen to cells Transport of wastes and carbon dioxide away from cells Delivery of hormones and other regulatory substances to and from cells and tissues Maintenance of homeostasis Transport of humoral agent and cells of the immune systemMain Functions ◼ Transport of nutrients and oxygen to cells. ◼ Transport of wastes and carbon dioxide away from cells. ◼ Delivery of hormones and other regulatory substances to and from cells and tissues. ◼ Maintenance of homeostasis. ◼ Transport of humoral agent and cells of the immune system