What in the circulatory system transports this which helps regulate temperature?

The circulatory system transports blood, which plays a crucial role in regulating body temperature. When the body heats up, blood vessels near the skin's surface dilate, allowing more blood to flow and releasing heat. Conversely, when it's cold, blood vessels constrict to retain heat, helping to maintain a stable internal temperature. This process is vital for homeostasis and overall health.