If you’ve ever looked at a frog’s head, you might have noticed that they don’t have external ears. So How do they hear?

Paul Andersen explains how cells are selectively permeable with the help of their cell membrane. The main constituents of the cell membrane, including cholesterol, glycolipids, glycoproteins, phospholipids, and proteins are included. ...

What's happening inside our ears when we can hear that ringing? What's happening inside our brains? Sit back, clean the wax out of your ears, and let Michael Aranda explain!

Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane.

The amazing legacy of animal cells.

Why do our muscles get tired and sore after exercise? Explore how our muscles function, and how you can exercise longer without experiencing muscle fatigue. -- You're lifting weights. The first time feels easy, but each lift takes more...

The animal kingdom is diverse, fascinating, and even inspires the medical world!

Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also create some by products we're pretty fond of as well.

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different...

Your hands, up close, are anything but smooth. With peaks and valleys, folds and rifts, there are plenty of hiding places for a virus to stick. If you then touch your face, the virus can infect you. But there are two extraordinarily...

Ever notice how cereal clumps up in your bowl, or how cereal sticks to the edges of the bowl? Bubbles in beverages do the same thing.You've probably seen this surface tension and buoyancy at work, but did you know there's some...

Can you feel them in your fingers? How about in your lungs? Vibrations are all around us, so let’s explore some everyday vibrations!

Paul Andersen describes the defining characteristics of the domain Eubacteria. He begins with a quick description of the phylogeny of bacteria and horizontal gene transfer. He then surveys the structures of a bacteria; nucleoid region,...

Biology and technology grew closer together when scientists manufactured neurons that acted like those in a brain! And birds evolved to protect themselves in two ways: fight and flight.

In this video Paul Andersen explains how the chloroplast in plants harnesses power from the Sun to form high energy molecules like glucose. The structure of a chloroplast as well as a brief discussion of the light reaction and Calvin...

Paul Andersen gives you a brief introduction to the cell membrane. He starts by describing amphipathic nature of a phospholipid and how it assembles into a membrane. He gives an overview of the fluid mosaic model inside cells. He...

Forget lab rats — meet the Chinese or striped-back hamster, an unassuming little rodent whose role in research over the years has led to breakthroughs in genetics, pharmaceutics and more!

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.

Hank begins a series of videos on organ systems with a look at the nervous system and all of the things that it is responsible for in the body.

Paul Andersen covers the processes of aerobic and anaerobic cellular respiration. He starts with a brief description of the two processes. He then describes the important parts of the mitochondria. He explains how energy is...

Imagine you swallowed a small bird and suddenly gained the ability to fly - or you ate a cobra and were able to spit poisonous venom! Well, throughout the history of life (and specifically during the evolution of complex eukaryotic...

Paul Andersen explains the process of photosynthesis by which plants and algae can convert carbon dioxide into useable sugar. He begins with a brief description of the chloroplast. He describes the major pigments in a plant (like...

Hank describes why plants are so freaking amazing - discussing their evolution, and how their cells are both similar to & different from animal cells.

Paul Andersen takes you on a tour of the cell. He starts by explaining the difference between prokaryotic and eukaryotic cells. He also explains why cells are small but not infinitely small. He also explains how the organelles work...