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.

Learners study two diagrams of the lymphatic system and then test their knowledge in drag-and-drop exercises.

In this animated and interactive object, learners examine the location, structure, and function of the juxtaglomerular (JG) apparatus.

In this interactive object, learners identify the parts of an animal cell and its organelles.

In this learning activity you'll practice converting from one metric unit to another.

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.

Learners take a close look at the Edison Wire System and observe how the current values through the two lines and the neutral of the system change as the loads vary.

Learners view the waveforms and voltages of an Edison Three-Wire System and read a description of the polarities across the secondary of the center-tap transformer. This transformer supplies power to residential homes.

In this animated object, learners trace the olfactory pathway from the nasal cavity to the olfactory cortex.

Put these body systems in sequence

Uranus [yoor-uh-nuh s] is the seventh planet from the Sun. It’s barely visible to the naked eye, and is the first planet discovered with the use of a telescope.

a game to test your knowledge on the human digestive system