The American Physiological Society fosters research, education, and the presentation of information for those who study physiology. This site is a must for the serious physiology student.
The Human Anatomy and Physiology Society home page hosts abundant information including local and national conferences, newsletter, anatomy and physiology web sites, and other resources. See the APS Undergraduate Education page.
For an excellent review of human anatomy, check out The Visible Human Project. The National Library of Medicine has undertaken this monumental effort to present three-dimensional images of the male and female body.