Cancer usually begins with one tumor in a specific area of the body. But if the tumor is not removed, cancer has the ability to spread to nearby organs as well as places far away from the origin, like the brain. How does cancer move to...

Nothing is guaranteed in life except death, taxes, and entropy. What do other life forms have to teach us about staying alive as we get old, and will we ever conquer death?

Human bodies aren't built for extreme aging: our capacity is set at about 90 years. But what does aging really mean, and how does it counteract the body's efforts to stay alive? Monica Menesini details the nine physiological traits that...

You put a dying person in suspended animation until, possibly thousands of years from now, medical science is able to cure them... or their brain can be put in a sweet robot body. It's an age-old sci-fi trope, but there are scientists...

Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

From something as miniscule as a cell to the biosphere we all call home, living things fit together in numerous interesting ways. Bobbi Seleski catalogs biology from our body and beyond, tracking how unicellular organisms, tissues,...

The human body is a complicated thing! To be able to move, fight off diseases, and even see colors, lots of different systems and organs need to work together. Squeaks' robot body is pretty complicated, too, so Jessi has put together a...

As anyone who's seen a mummy knows, ancient Egyptian priests went to a lot of trouble to evade decomposition. But how successful were they? Len Bloch details the mummification process and examines its results thousands of years later.

Ethanol: this molecule, made of little more than a few carbon atoms, is responsible for drunkenness. Often simply referred to as alcohol, ethanol is the active ingredient in alcoholic beverages. So how exactly does it cause drunkenness,...

In this episode of Crash Course Anatomy & Physiology, Hank gives you a brief history of histology and introduces you to the different types and functions of your body's tissues.
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Today Hank wraps up our look at Connective Tissues with a discussion of its various types and a breakdown of what you can and can't easily break down. Also chicken.
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Paul Andersen explains how organs work together to form organ systems and how organ systems work together to form organisms. The kidney and bladder work together to filter blood in the excretory system. The circulatory and respiratory...

Originally discovered by accident, X-rays are now used about 100 million times a year in clinics around the world. How do these magic eyes work? Ge Wang details the history and mechanics of the X-ray machine and CT scanners.

Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals" has been called into question because they are so simple) and finishing with the most complex...

So... do plants need dirt? The truth might shock you. In this episode of Crash Course kids, Sabrina talks about how plants get energy and how that energy is transported around them. Also, she talks about dirt.

Paul Andersen introduces Anatomy and Physiology in this podcast. He starts by describing how the form of an object fits the function. He then explains the themes of homeostasis and hierarchy. He describes the four major types of tissues;...

Hank begins teaching you about your endocrine system by explaining how it uses glands to produce hormones. These hormones are either amino-acid based and water soluble, or steroidal and lipid-soluble, and may target many types of...

Selling organs is illegal almost everywhere in the world, but some people argue that it could save thousands of lives.

Howcast - Learn guided relaxation exercises that relax your shoulders, torso and pelvis from wellness consultant Samantha Ibarguen in this Howcast video.

Howcast - Learn what no on tells you about giving birth from childbirth educator Elizabeth Mangum-Sarach in this Howcast video.

Howcast - Learn about digestive disorders from gastroenterologist Lisa Ganjhu, M.D. in this Howcast video about stomach problems.

Howcast - Learn what a necropsy is in this Howcast video featuring bunny lover Amy Sedaris and rabbit expert Mary E. Cotter.

Biological organization is the hierarchy of complex biological structures and systems that define life. Cells are the basic units of all life, functional groups of cells form tissues, functional groups of tissues form organ, functional...

This video provides an overview of different sea creatures, explaining which ones are fish and which ones are mammals. It also delves into the anatomy and characteristics of fish, including their fins, circulatory system, feeding habits,...