National Institutes of Health
National Library of Medicine: Your Beating Heart
In this lesson plan site, the students will learn about the circulatory system and perform an experiment where they take their pulse after various activities.
BiologyWise
Biology Wise: The Circulatory System of Fish
Describes the anatomy of a fish's circulatory system and how the blood circulates in a fish.
CNN
Cnn: Patient Gets 1st Totally Implanted Artificial Heart
In July 2001, a major advancement in medical science was made. Find out about the first completely implanted artificial heart that totally replaced the function of the human heart. Read about what the AbioCor is and view a video on the...
Khan Academy
Khan Academy: Tonicity Comparing 2 Solutions
Find out how tonicity is determined by ions that don't move across membranes and how it affects movement of water.
Other
Digital Frog: Frog Circulation
A digital diagram from Digital Frog of the circulatory system of a frog. Very nice, and very fake since it is not a real frog.