Give and Let Live
Blood and Transplant: Blood
Why is blood donation so important, anyway? Science and health classes across multiple grades benefit from an in-depth look into the need for and process of blood donation. With an emphasis on presenting the topic in a non-threatening...
Other
Fun Science Gallery: Let's Observe the Red Blood Cells
A brief overview of red blood cells accompanies a blood smear observation experiment. Includes drawings and photographs to aid in understanding.
CK-12 Foundation
Ck 12: Biology: Blood
[Free Registration/Login may be required to access all resource tools.] Defines and describes red blood cells and white blood cells, and describes the roles of platelets.
BBC
Bbc: Gcse Bitesize: Cellular Respiration and Transport
The circulatory system transports substances between the exchange surface and cells. It delivers oxygen and glucose to the tissues for respiration, which is the release of energy to cells.