In an interactive exercise, learners identify the human body sites that harbor a normal resident flora and the sites that are sterile.

In this screencast, learners examine the bones of the appendicular skeleton.

This animated object illustrates the events leading to the migration of phagocytes into areas of tissue damage and/or bacterial presence. Learners view bacterial cell phagocytosis, its subsequent enzymatic digestion, and exocytosis.

In this animated and interactive object, learners examine the red blood cell's life cycle and function. A brief exercise completes the activity.