While a herd of cows are eating, they tend to all face the same direction. Viewers explore the world of animal behavior, looking at both morphology and physiology, with a video that focuses on the evolutionary history of learned...

How do bodies digest all of the parts of a hamburger? An interesting video follows a hamburger through the digestive system, showing the pathway of digestion and explaining how each of the components of a hamburger—the bun, the meat, and...

Many define biology as the study of life but can't agree on a definition of life. Trying to explain all of the domains and subdomains of biology seems a bit easier than defining life. See a full map of the topics covered by the general...

What makes the elite athletes elite? Young scholars watch a thorough video lesson that describes the science of muscle movement. The narrator explores the physical requirements of different sports.

Do you sneeze when you go from dark to light areas? Twenty-five percent of the population does! It turns out that the characteristic is due to genetic code. Explore why this happens with a video from the Veritasium playlist that...

Is psychology a natural science? A brief video explains William James's theory of psychology as it connects to physiology, known as the James-Lange Theory of Emotion, and his belief that the mind and body work together to create one's...

The average human body loses 40–100 strands of hair in one day. This is the first video in a series of 47 and introduces scholars to anatomy and physiology, the study of the human body, and how it works. The narrator shares the history...

Muscle tissue is three times more efficient at burning calories than fat. Here is a video that explores how form fits function, introducing anatomy and physiology. The instructor then explores homeostasis, hierarchy associated with...

Barbara McClintock discovered mobile genetic elements and was eventually awarded a Nobel Prize, but people first laughed at her because of her gender. Learn more about her contributions to genetics with a biographical video.

A foundation for understanding how the nervous system signals for a muscle to contract. [14:42]

Carefully follow five different preload scenarios to see how each one will have a different effect on how actin and myosin line up. Rishi is a pediatric infectious disease physician and works at Khan Academy. [14:18]

Get a clearer idea of what a "Depolarization Wave" means and how it goes from cell to cell through the entire heart! Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:44]

See exactly how calcium binds troponin-C and allows myosin to do some work. Rishi is a pediatric infectious disease physician and works at Khan Academy. [10:03]

A fascinating interactive laboratory in which simulations allow students to explore techniques of cardiac diagnosis and learn about cardiac structure/function. Excellent supporting information and resources for teachers and students.