In this animated activity, learners explore three major methods of heat transfer and practice identifying each.

Students identify the parts of a triple beam balance and practice measuring the mass of objects.

In this animated object, learners are introduced to the structure and function of animal cell organelles.

In this animated object, learners examine neutral fats, phospholipids, and cholesterol. The molecular formula and general function for each are shown.

In this animated object, learners read an introduction to protein structure and function.

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.

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

In this animated and interactive object, learners identify the valves and chambers of the heart.

In this animated activity, learners examine the two major phases of cell division: mitosis and cytokinesis.

In this animated object, learners examine water molecules moving through a semipermeable membrane.

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

In this interactive object, learners review how to read a caliper. They then test their skills with eight practice questions.

In this interactive and animated object, learners read a description of the number, name, and function of the cranial nerves. A matching quiz completes the activity.

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

In this interactive object, learners read the definitions of the parts of a cell and assemble a basic eukaryotic cell in a drag and drop exercise. A matching quiz involving cell terms and their definitions completes the activity.

In this animated activity, learners examine how organs are visualized in three dimensions. The terms “longitudinal,” “cross,” “transverse,” “horizontal,” and “sagittal” are defined. Students test their knowledge of the location of abdominal pelvic cavity organs in two drag-and-drop exercises.

In this interactive object, learners review the major parts of the skeletal system by clicking on the correct term as each bone or joint is highlighted on a skeleton.

In this interactive object, learners examine the locations of major body cavities and their protective membranes. A drag-and-drop exercise completes the activity.

In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.

In this highly interactive object, learners associate basic line types and terms with engineering drawing geometry. A quiz completes the activity.