Untamed Science
Untamed Science: Biology: Human Biology: Circulatory System
Read and watch how the blood, the heart, and the blood vessels keep the blood flowing through our bodies. [6:00]
Biology Pages
Kimball's Biology Pages: Anatomy of the Human Circulatory System
This site is produced by John W. Kimball, a retired biology teacher who wrote the textbook that these pages came from. The excerpt explains the different parts of the circulation system and how they function. Includes great pictures!
CK-12 Foundation
Ck 12: Life Science: Blood Vessels
[Free Registration/Login may be required to access all resource tools.] The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart,...