Learners complete two exercises. In the first quiz, they divide viruses into two categories: RNA and DNA. They later match each virus with the disease it causes.

In this animated object, learners view the "T" and "P" waves and the "QRS complex." A brief quiz completes the activity.

In this animated object, learners examine the various connective tissue layers of the muscle organ. The terms "prime mover," "synergist," "antagonist," "origin," and "insertion" are defined.

Learners test their knowledge of fungal diseases by completing six exercises.

In this interactive object, learners examine the neuron pathway into and out of the spinal cord. They complete the activity by testing their knowledge of vocabulary and the location of spinal cord structures.

In this interactive object, learners match the bacterial etiologic agent to the disease it causes.

In this animated object, learners examine the different types of joints and their movements.

In this animated object, learners examine the function and location of the motor neurons and the damage that can result when they are injured.

In this interactive object, learners review the case of a patient with meningococcal meningitis.

In this learning activity you'll observe information and formulate an evaluation that includes diagnosis and microorganism identification.

In this animated and interactive object, learners read about the parts of the eye. A short quiz completes the activity.

In this interactive object, learners categorize different metabolic activities as catabolic or anabolic and follow a glucose molecule through the processes of glycolysis, aerobic respiration, and fermentation.

Learners match diseases with their portals of entry, causative agents, and associated vectors.

Students choose the hypothesis and practice describing bacterial colonies using the steps of the scientific method.

In this colorful and interactive object, learners examine the structure and function of muscle and connective tissues. A quiz completes the activity.

In this interactive object, learners identify a person's regional body parts.

This learning object demonstrates the process by which antigens are identified, processed, and presented to mediators of the cellular immune system.

In this animated and interactive object, learners examine ABO blood antigens and Rh antigens and their compatibility.

Learners read how microbes in such items as yogurt, bread, insulin, and insect sprays improve our lives.

In this animated and interactive object, learners examine ABO blood antigens and Rh antigens and their compatibility.

In this animated activity, learners examine hearing and balance. Detailed drawings of the outer, middle, and inner ear structures are included.