In this video learners view the valves and chambers of the heart.

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

In this interactive object, learners examine the structure and function of the sense of taste.

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

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

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 screencast, learners examine hearing and balance. Detailed drawings of the outer, middle, and inner ear structures are included.

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

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

In this learning activity you'll study the structure of the cell membrane and construct it using the correct molecules.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

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.

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

In this learning activity you'll review how every protein molecule of an organism is synthesized by that organism in a prescribed process. This activity helps students understand the fundamental life process of making protein.

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

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, students observe how ATP energy is used to move substances across the cell membrane from an area of lower concentration to an area of higher concentration and when something too large needs to get in or out of a cell.

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

Learners view an explanation of how to read a graduated cylinder by measuring the lowest portion of the meniscus. A quiz completes the activity.

In this animated object, learners examine the major events that occur at the neuromuscular junction.

In this animated object, learners examine the formation of ester bonds in the synthesis of lipids using triglyceride biosynthesis as an example. Ester bond formation is described as a dehydration synthesis reaction.

Learners examine a table containing the names of common cations and anions.

In this animated and interactive object, learners examine how blood flows through the heart and lungs. A brief quiz completes the activity.

In an interactive exercise, learners identify the human body sites that harbor a normal resident flora and the sites that are sterile.

Learners examine the function of each part of a microscope and follow step-by-step instructions on how to focus on a specimen. They also review the proper use and care of a microscope and test their knowledge in two drag-and-drop exercises.