Categories 4. Circulatory and Respiratory system How big is the circulatory system? Post author By Muhammad Umair Post date January 16, 2022 No Comments on How big is the circulatory system? Your body has more than 60,000 miles of blood vessels that circulate about 1.5 gallons of blood every day. ← How can I prevent circulatory system problems? → What is red blood and blue blood? Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.