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

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

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.

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.

The learner views several animations to study Newton's First Law of Motion, also known as "The Law of Inertia."

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.

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

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

Learners study the process used to diagram sentences, and then work through numerous exercises to test their knowledge.

In this animated object, learners read a brief description of the roles of the hypothalamus, emotions, and adrenal secretions during the stress response.

In this activity, students practice recognizing the different types of noise in the communication process.

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

Explore what proteins are, their structure, and their functions.

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 learning activity you'll review possessive form of nouns. You'll demonstrate competency by typing in the correct response.

In this animated object, learners examine the eight cranial bones, the fourteen facial bones, and the ribs.

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.

Explore what passive transport diffusion is and how it moves water through a membrane.

In this learning activity you'll use Maslow's Hierarchy and choose which need is taking precedence and which is being sacrificed in each situation.

In this learning activity you'll review the structure and function of the different tissues of the human body.

In this screencast, you'll examine writing a sentence outline using complete sentences for headings, subheadings, main points, and subpoints.

Students read about the six theoretical perspectives used to explore psychological events and do an interactive exercise.

Viewers watch an introduction to monosaccharides, disaccharides, and polysaccharides. The processes for dehydration synthesis and hydrolysis.

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

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