Khan Academy
Khan Academy: Tissues, Organs, & Organ Systems
Describes the main tissue types and organ systems of the body and how they function together.
City University of New York
Brooklyn College: Exploring Life @ Bi Odot Edu: Signs of Life: Complexity
A nice introduction to the idea that living things are highly organized at several different levels. Great as an introduction to biological complexity.
Open Curriculum
Open Curriculum: Organization of the Human Body
An illustrated article which helps students understand the levels of organization of the human body.
CK-12 Foundation
Ck 12: Biology: Organization of the Human Body
[Free Registration/Login may be required to access all resource tools.] Introduces cells, tissues, organs, and organ systems in the human body.
CK-12 Foundation
Ck 12: Plix: Organization of Living Things
[Free Registration/Login Required] In this interactive, explore the organization of living things by correctly organizing the labeled circles.