To take one step, the body uses about 200 muscles. In the video, learners see the difference between the three types of muscles found in the human body—skeletal/striated, smooth, and cardiac. The instructor then explains, in detail, how...

Focus on macro-molecules including nucleic acids, proteins, lipids, and carbohydrates. A video explains which are monomers, which form polymers, and the process of changing from one to the other. It also covers the characteristics of...

Explain the two-step process of photosynthesis to your high school biologists with a focus on the Calvin cycle. Using adorable animation, a video likens the cycle to a tiny, sustainable factory. Even though the enzyme-bird rubisco and...

Meet adorable, animated chloroplasts as they produce glucose with the help of the sun. Viewers learn how carbon, oxygen, hydrogen, and electrons are combined to form carbohydrates with an engaging video. The narrator also explains how...

Muscles and the chemicals myosin and actin are described in the sliding filament theory by Paul Andersen using pictures on his Smart Board. Give your young scientists a clear idea of muscle contraction by showing this video.

The differences between prokaryotic and eukaryotic cells are explained and the parts of each are highlighted. Discover the major organelles found in an animal cell and each of their functions. Paul Andersen does an excellent job once...

This clip picks up right where the Khan Academy's Photosynthesis video left off. Chemicals such as hydrogen and compounds such as NADPH are reviewed along with details including the stroma, thylakoid, lumen, and grana. See the parts of a...

Biology classes will bubble with excitement as they complete this assignment. Beginning with an informative overview of cellular respiration and fermentation processes, the highlight comes as an experiment in determining the rate of...

Emerging ecologists need a full understanding of life, from the inner workings of a cell to the complex relationships among organisms. This examination is meant to assess high schoolers after an entire year course on the living...

The living environment, from the interior of a cell to the complex relationships among populations, are queried in this final examination. Learners look at air pollution maps, diagrams of cells, population graphs, and drawing of cells....

The 2005 version of the Regents High School Examination in the area of ecology is as comprehensive as previous years' exams. It consists of 40 multiple choice questions on everything from the structure of DNA to the interactions within...

Environmental science enthusiasts show what they know at the end of the year by taking this full-fledged final exam. They answer multiple choice, graph interpretation, and essay analysys questions, 73 of them in all. Topics range from...

Tne New York Regents High School Examinations are comprehensive and include various styles of questions, includingmultiple choice and the analysis of graphs. This particular version, the 2008 Living Environment exam surveys a variety of...

Sal from Khan Academy shows your class a kidney on his Smart Board and writes down the main functions of the kidneys and nephrons. The different parts are highlighted and explained in detail. Continue to review the kidneys and nephrons...

Survey the metabolism process from respiration through the production of the ATP molecule with this seven page AP biology worksheet. Pupils write short answers on the lines provided and label a diagram of the cellular respiration process. 

A lively presentation presents general facts and history of nucleic acids in a note-taking format. Every slide contains colorful photos or graphics to illuminate and engage. Biology aces learn about the function and structure of these...

Obtain a basic understanding of photosynthesis at a chemical level. The steps involved are introduced and simplified, but they are still difficult to understand. I suggest using this resource to supplement a lecture. An overview is given...

Salman Khan is very enthusiastic about the topic of cellular respiration! He provides an interesting presentation of the respiration process. Expect to learn about the basic stages of respiration, how it works in the human body, and the...

Many of the concepts that are mentioned as an aside in previous videos are re-introduced here. By listening to Salman's recap of an action potential, students will understand how a nerve impulse can stimulate the release of...

If you need a summary of Respiration, then these 3 videos will be invaluable to your class. The actual reactions happening at the 3 stages of respiration are explained step-by-step with an explanation of every chemical bond broken or...

Review of reduction and oxidation opens this video. It really helps stimulate understanding of these biochemistry topics. By explaining the loss or gain of electrons, Salman Khan is able to clarify the concept of respiration processes.