The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump ...

Your heart's will to beat ... film offers a look at respiration and a tour around the circulatory system and digestive system in the human body, through blood vessels and into mitochondria.