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...

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...

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...

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

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 mentioned as an aside in previous videos are reintroduced here. By listening to Salman's recap of an action potential, students will understand how a nerve impulse can stimulate the release of neurotransmitters which...

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.

Here is accessible, understandable information about ADP and ATP. By explaining how ATP is hydrolyzed, Sal Khan is able to demonstrate how energy is released into a cell.

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

The third video in the respiration cycle sequence provides an excellent lesson on the electron transport chain.

Gene mutation occurs at a rate much higher than many realize. Doctors treating cancer and other illnesses must learn to adapt quickly after each mutation. Viewers observe an animation and watch lecture with props to see what happens when...

The 37th video in a series of 47 about the human body delves into metabolism. Scholars review cellular respiration and see how it, ATP, and glycolysis play a role in metabolism and how all of this relates to sugar levels in the body. 

Have you ever wanted to glow? The reasons creatures glow change based on their situation and biology. The video lesson discusses mating rituals, defense, and reasons we don't understand yet. It also explains how creatures glow and...

The spotted salamander is currently the only known photosynthetic vertebrate. A video introduces three animals that are all photosynthetic in their own way. It explains the way they get energy from the sun as well as other quirky traits...

The science of marathon running is the subject of a resource that begins with the history of the marathon and why it is 26.2 miles long, and then goes into the biology in our bodies and the way our muscles, bones, and other physical...