The human body is made from millions of individual cells. Blood, flowing through the circulatory system, supplies the cells with food and oxygen; it also carries away waste from the cells. “Blood and Circulation” is part of the “Mechanics of Life” series, an introduction to human biology and physiology tailored to the middle-school audience. Humans and other vertebrates are the most prominent animals on earth. There is a great variety among them, but they share certain characteristics that have made them dominant. The vertebrate organism can be viewed as a machine that is the sum of a number of independent yet interacting systems and sub-systems. The “Mechanics of Life” video series describes and illuminates five of the principal systems.
12 minutes • Color