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

In this animated object, the learner examines 17 types of joint movement.

In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

In this animated and interactive object, learners examine ventilation, external and internal respiration, and gas transport.

In this animated object, learners view molecules as they collide and move between two different solutions. They also observe what happens when the temperature of the solutions is raised or lowered.

Learners examine the location, structure, and function of the unipolar and multipolar neurons.

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

In this interactive object, learners examine how to properly dilute hydrochloric acid.

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

Boyle's Law states that gas volume varies inversely with the pressure at constant temperature and is described by the equation PV = constant. An example of a sample of gas at two conditions of P and V is used to illustrate the law.

In this video, you'll review how every protein molecule of an organism is synthesized.

In this screencast, you'll observe two vehicles moving across the screen at different rates then describe the motion. Additionally, you'll select the corresponding graphs of distance vs. time, velocity vs. time, and acceleration vs. time for each vehicle.

In this interactive object, learners read about the occupations that are most at risk for bloodborne pathogen exposure. They also read about the most common pathogens and how they are transmitted. This learning object is based on information from the U.S. Occupational Safety and Health Administration.

In this animated and interactive object, learners examine the properties of liquids, solids, and gases.

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

In this animated and interactive object, learners observe how two, three, or four groups of electrons around the central atom cause the shape of the molecule to be linear, trigonal planar, bent, tetrahedral, or pyramidal. Seven examples and eight interactive questions are provided.

The Animal Welfare Act, or AWA, gives protection to animals used in research, education, and entertainment. Explore ethical use and some of the current alternatives in this module.

Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.

Learners read how fruits are classified according to their texture and according to how they developed from their floral anatomy.

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