It has four chambers. Humans have a double circulatory system, which means the blood passes through the heart twice on each loop around the body. It travels from the heart to the lungs ...

Locate each of the paired and unpaired branches from the dorsal aorta, using Figure 5.4, pages 58 - 60. Keep function and integration of circulatory system in mind as you locate organs.

This short film explains how the heart and circulatory system work, taking a close look at the four chambers, two sides, and the valves of the heart. BBC Teach has thousands of free, curriculum ...