The Visible Heart
This animation focuses on the gross anatomy of the human heart. The model of the heart is semitransparent, allowing you to see through the thick cardiac muscle into the four heart chambers.
The job of the human heart—in fact of all vertebrate hearts—is to pump oxygenated blood throughout the cells of the body and to return deoxygenated blood to lungs or gills for replenishment
Diffusion Across Membrane
This animation describes two different ways by which chemicals migrate through membranes: passive diffusion and active transport.
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