Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Health and medicine: Aldosterone removes acid from the blood
See how Aldosterone acts on the alpha-intercalated cell to remove protons (acid) from the blood. Rishi is a pediatric infectious disease ph…
VideoFree11 minutes
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Health and medicine: Valvular heart disease causes
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree9 minutes
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Health and medicine: Schwann cells
This video describes the structure and function of Schwann cells. By Matt Jensen. Health and medicine The medical world can be a confusing …
VideoFree3 minutes
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Health and medicine: Activating angiotensin 2
See how Renin and ACE work to cut Angiotensinogen down to size! Rishi is a pediatric infectious disease physician and works at Khan Academy…
VideoFree10 minutes
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Health and medicine: Mantoux test (aka. PPD or TST)
Learn how the Mantoux test is done and how it works. Rishi is a pediatric infectious disease physician and works at Khan Academy. These vid…
VideoFree9 minutes
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Chemistry: Weak acid equilibrium
Quick overview of Ka and pKa. Example of calculating the pH of a weak acid solution. Chemistry Did you know that everything is made out of …
VideoFree10 minutes
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Biology: Introduction to evolution and natural selection
Introduction to how groups of organisms evolve and how natural selection can lead to evolution. Biology Life is beautiful! From atoms to ce…
VideoFree18 minutes
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Electrical engineering: Attach the LED eyes
Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…
VideoFree9 minutes
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Organic chemistry: Stability of cycloalkanes
How to analyze the stability of cyclopropane, cyclobutane, cyclopentane, and cyclohexane Organic chemistry Sal and Jay cover topics covered…
VideoFree8 minutes
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Organic chemistry: Stabilization of a conjugate base: resonance
How resonance affects the stability of a conjugate base Organic chemistry Sal and Jay cover topics covered in college organic chemistry cou…
VideoFree7 minutes
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Chemistry: 2015 AP Chemistry free response 3d
Calculating the pH at the half-equivalence point for the titration of a weak base with HCl. From 2015 AP Chemistry free response 3d. Chemis…
VideoFree4 minutes
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Cosmology and astronomy: Plates moving due to convection in mantle
Plates Moving Due to Convection in Mantle Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, yo…
VideoFree6 minutes
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Electrical engineering: Negative frequency
The concept of negative frequency is perplexing, but it makes sense when you think about rotating complex exponentials Electrical engineeri…
VideoFree7 minutes
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Biology: Ecosystem ecology: Links in the chain
Hank discusses ecosystems, trophic structure, and the flow of energy through food webs. Biology Life is beautiful! From atoms to cells, fro…
VideoFree10 minutes
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Biology: Oxidative phosphorylation and the electron transport chain
How oxidation of co-enzymes like NADH can lead to the production of ATP through oxidative phosphorylation. Biology Life is beautiful! From …
VideoFree16 minutes