In this animated object, learners compare the mode of action of steroids with the action of amino acid-based hormones.

In this screencast, learners examine the movement of fluid within the vascular system.

Explore what passive transport diffusion is and how it moves water through a membrane.

Learners watch a brief video clip. They then follow step-by-step instructions on how to do a urine colony count and examine the criteria for determining if a colony count represents an infection. A brief quiz completes the object.