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Click image to play video	Movement of Blood cells (view at the cellular level)
Location	http://scied.fullerton.edu/VIDA/VIDAImages/U2M5Daphnia/F00014.html
Observations	This clip demonstrates movement of blood at the cellular level in the open circulatory system of Daphnia. The pin drop blood cells are traveling from left to right in this video.
Explanations	The circulatory system of humans is closed, meaning that blood is enclosed by blood vessels. This image is that of an open system, meaning the blood moves freely throughout the body. In both systems, blood is pumped to the tissues of the body and then nutrients diffuse into the cells of those tissues.
California Standards	Structures and functions
National Standards	Organ systems
Related NSF Exemplary Curriculum	Human body Human body systems Investigating human systems
Related Sets	The circulatory, digestive, and respiratory systems work together.
Creative Commons License	This work is licensed under a Creative Commons Attribution-Share Alike 2.5 License.
Authors	Katie Hale khale92807@aol.com CSUF
Publisher	CSUF Aug 18 2007

This material is based upon work that was supported by the National Science Foundation under Grant No. 0127164 to California State University Fullerton. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.