Learners view video clips demonstrating acid-fast staining procedures. Correctly stained slides are shown. The learning object includes two matching exercises.

Learners listen to the pronunciation of viral names and then type the terms. They may choose the number of names that they wish to spell (up to 16). Immediate feedback is given, and a final score is provided at the end of the activity.

In this interactive learning activity, learners explore factors that contribute to the aging process. Learners calculate their age based on biological, psychological, and social experiences. Further reflection allows the learner to consider options and assess issues that impact the aging process.

In this animated activity, learners examine muscle cell contraction and relaxation and consider the role of calcium ions.