Some science behind the scenes
Blood circulatory system
The Circulatory system is an organ system consisting of the heart, blood, and blood vessels, that helps maintain homeostasis (e.g., regulation of temperature) and transport life-giving oxygen, nutrition, and hormones to cells throughout the body and toxic waste products away.
As can be seen from the diagram all the main organs benefit from this blood supply - the brain, the heart, the kidneys, the lungs, the genitalia, the stomach and the intestines. The arteries are shown in red and the veins in blue.