This learning object could be better understood as a collection. For each of 12 topics (touch, hearing, balance, etc.) the author provides an animated Flash presentation, a pdf. version for those who may not have flash, practice problems, and links to more information. The flash presentations themselves contain several subtopics. For example, "the eye" has subtopics of lens, retina, fovea, etc.
For best use, I would recommend the user pinpointing the exact location of the specific materials they wish their students to review, otherwise, the shear volume of material may seem intimidating.
My only critique is that the home website is a bit difficult to understand at first. It takes the user a few minutes to understand how the site is organized, and what use they could make of it. Also, there is no button to return to the homepage, once one is within a flash presentation for a specific topic.