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.

The cardiovascular system, the human body’s circulatory system, is a vital network of organs and tissues such as the blood, heart, and blood vessels responsible for transporting blood. The circulatory ...

This short 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. There is a detailed ...