Instructional Video6:48
Khan Academy

Correction to Sodium-Potassium Pump Video, Health and Medicine

For Students 10th - 12th
This is a brief correction to the video detailing the pumping of three sodium ions and two potassium ions. There is also a letter from a professor providing information about the ratio of three to two ions and explaining that the...
Instructional Video2:57
Howard Hughes Medical Institute

Prialt Blocks Pain Signaling in Mice

For Students 6th - 12th Standards
Prialt, a prescription pain medicine, is used to treat severe and chronic pain in humans, but is extremely toxic to fish. To understand how Prialt works, class members watch a short animated video that models how calcium channels that...
Instructional Video9:57
Crash Course

The Integumentary System – Skin Deeper (Part 2)

For Students 9th - 12th Standards
The thinnest skin on your body is found on your eyelids, and the thickest is found on the soles of your feet. This seventh video in a series of 47 explores how the integumentary system protects people and also helps them interact with...
Instructional Video11:44
Crash Course

The Nervous System – Action! Potential! (Part 2)

For Students 9th - 12th Standards
There are about 100,000 chemical reactions happening in your brain every second to help you sense and respond to the world around you. After a brief review of electricity, the narrator explores the action potential neurons used to sense...
Instructional Video10:02
Crash Course

Peripheral Nervous System

For Students 9th - 12th Standards
The brain does not feel pain, which is why surgeons can perform brain surgery without anesthesia or while the patient is awake. Pupils see how the peripheral nervous system allows humans to feel pain. The narrator explores the afferent...
Instructional Video9:34
Crash Course

Endocrine System – Hormone Cascades (Part 2)

For Students 9th - 12th Standards
More than 27 million Americans have some type of thyroid disease. In the 24th video in a series of 47, scholars see how the hypothalamus-pituitary-thyroid axis works in the human body. The narrator then explores what happens to the body...
Instructional Video10:00
Crash Course

Blood – True Blood (Part 1)

For Students 9th - 12th Standards
Teach your class about human blood and explain why donation is so important using the 29th video in a series of 47. Learners explore the basic components of blood, how cuts stop bleeding, and how antigens determine blood types. 
Instructional Video10:18
Crash Course

Urinary System (Part 1)

For Students 9th - 12th Standards
Explore the urinary system with your class using the 38th video in a series of 47 on the human body. The narrator teaches about the anatomy, the functions of each organ, and how this system filters blood to get rid of waste and...
Instructional Video9:44
Crash Course

Immune System (Part 2)

For Students 9th - 12th Standards
Scientists are creating an experimental vaccine for the Ebola virus, which in clinical trials, is working. Such vaccines are the topic of a video about the adaptive immune system. The narrator discusses how a body reacts to...
Instructional Video10:43
Crash Course

Tissues (Part 1)

For Students 9th - 12th Standards
Once a nerve cell is damaged, it cannot be reproduced. Video number two in a series of 47 introduces high schoolers to tissues, focusing on the four types: nervous, muscle, epithelial, and connective. The narrator teaches their...
Instructional Video10:16
Crash Course

Tissues – Epithelial Tissue (Part 2)

For Students 9th - 12th Standards
Epithelial tissues plays a variety of roles in the human body, including covering, lining, making a barrier, protection, excretion, filtration, absorption, and sensation. The video teaches high schoolers about epithelial tissue and its...
Instructional Video9:40
Crash Course

The Integumentary System – Skin Deep (Part 1)

For Students 9th - 12th Standards
Every minute, your skin sheds more than 30,000 dead skin cells. The sixth video of 47 teaches pupils about the three layers of skin, their composition, and different cell types. It takes a trip through the layers to help individuals...
Instructional Video10:36
Crash Course

The Nervous System (Part 1)

For Students 9th - 12th Standards
If you line up all of the neurons in your body, they would stretch almost 600 miles! The seventh video in a series of 47 and explore the nervous system, both central and peripheral. The narrator teaches the organization and composition...
Instructional Video9:43
Crash Course

Tissues – Types of Connective Tissues (Part 4)

For Students 9th - 12th Standards
Did you know your blood and bones are examples of connective tissue? This is video number five in a series of 47 and further explores connective tissues. Pupils learn about other types of connective tissues, what these look like, where...
Instructional Video8:49
Crash Course

Autonomic Nervous System

For Students 9th - 12th Standards
The sympathetic nervous system is what puts a person into fight or flight mode in scary situations. The 13th video in a series of 47  covers the autonomic nervous system, specifically how the sympathetic and parasympathetic systems...
Instructional Video9:13
Crash Course

Immune System (Part 1)

For Students 9th - 12th Standards
A lack of good sleep weakens your immune system by making you more susceptible to infections and making recovery time longer. Video 45 in a series of 47 focuses on the immune system. Pupils hear how the body defends itself, from its...
Instructional Video9:37
Crash Course

Immune System (Part 3)

For Students 9th - 12th Standards
Who loves their immune system ... antibody? Antibody? The last video in a series of 47 takes a look at the cellular immune system. Learners see how specific cells in the body attack other body cells that are infected with pathogens. To...
Instructional Video10:38
Crash Course

The Skeletal System

For Students 9th - 12th Standards
Humans have 54 bones in their hands, fingers, and wrists, allowing for a variety of movement. The 19th video in a series of 47 introduces learners to the anatomy of the skeletal system. The narrator teaches about flat, short, and...
Instructional Video10:41
Crash Course

Muscles – Organismal Level (Part 2)

For Students 9th - 12th Standards
Humans use 200 muscles to take one step — that's a lot of muscles! Learners see how skeletal muscles work to pull on bones, creating movement. The narrator then explores motor units, muscle twitches, impulses, contractions, and isotonic...
Instructional Video10:25
Crash Course

Endocrine System – Glands and Hormones (Part 1)

For Students 9th - 12th Standards
Hug it out! Hugging releases oxytocin, a hormone proven to reduce swelling, thus hugging can heal physical wounds faster. Hormones control many things in the body, from healing it to causing emotions, so understanding more about them is...
Instructional Video9:04
Crash Course

Blood Vessels (Part 2)

For Students 9th - 12th Standards
High schoolers learn what blood pressure measures, how it becomes too high, and the effects on the body. The narrator also explains how the body can deal with high blood pressure on its own, at least for a short amount of time. 
Instructional Video10:01
Crash Course

Blood – There Will Be Blood (Part 2)

For Students 9th - 12th Standards
Since 2004, blood doping in cycling has dropped by 50 percent. The video opens with a narration about blood doping and then focuses on the structure of blood and how its parts work to keep the body alive. Classes learn about the...
Instructional Video10:55
Crash Course

Digestive System (Part 2)

For Students 9th - 12th Standards
It takes about seven seconds for food to move from the mouth to the stomach. Pupils follow food from the mouth through digestion, exploring where mechanical and chemical digestion occur. Saliva, enzymes, acids, and chyme are a small...
Instructional Video10:33
Crash Course

Metabolism and Nutrition (Part 1)

For Students 9th - 12th Standards
Use the 36th video of 47 to explore metabolism. Individuals begin to understand what metabolism is, physiologically what it does, and how anabolic and catabolic reactions assist in digestion. 

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