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: Hypoxic pulmonary vasoconstriction
Watch how blood gets diverted away from alveoli with low oxygen levels. Rishi is a pediatric infectious disease physician and works at Khan…
VideoFree9 minutes
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Health and medicine: Primary hypertension
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree6 minutes
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Biology: Human activities that threaten biodiversity
Human activities that cause a loss of biodiversity. Video by California Academy of Sciences. Biology Life is beautiful! From atoms to cells…
VideoFree13 minutes
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Biology: Ecosystem services
Describing and quantifying the benefits that healthy ecosystems provide to humans. Video by California Academy of Sciences. Biology Life is…
VideoFree9 minutes
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Organic chemistry: Stabilization of a conjugate base: hybridization
How increased s character in a hybrid orbital stabilizes the conjugate base Organic chemistry Sal and Jay cover topics covered in college o…
VideoFree6 minutes
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Biology: The digestive system
Hank takes us through the bowels of the human digestive system and explains why it's all about surface area. Biology Life is beautiful! Fro…
VideoFree11 minutes
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Health and medicine: Adding up resistance in series and in parallel
Learn about how resistance can be added up in series and in parallel (similar to electrical circuits!). Rishi is a pediatric infectious dis…
VideoFree11 minutes
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Health and medicine: Mitral stenosis
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: Preventing TB transmission
There are a number of ways that we can help to prevent TB from spreading, learn some of the most common ones. Rishi is a pediatric infectio…
VideoFree11 minutes
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Biology: Role of the sarcoplasmic reticulum in muscle cells
The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell. Biology Life is beautiful! From at…
VideoFree15 minutes
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Biology: 5 human impacts on the environment
Hank presents examples of how human activity can affect ecosystems. Biology Life is beautiful! From atoms to cells, from genes to proteins,…
VideoFree10 minutes
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Organic chemistry: Halogenation and ozonolysis of alkynes
Reaction of an alkene with a diatomic halogen (halogenation) or with ozone (ozonolysis). Organic chemistry Sal and Jay cover topics covered…
VideoFree7 minutes
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Organic chemistry: Aldol condensation
In aldol condensation, an enolate ion reacts with another carbonyl compound to form a conjugated enone. The process occurs in two parts: an…
VideoFree11 minutes
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Health and medicine: The bronchial tree
Follow the path of an oxygen molecule as it makes its way from your mouth down to an alveolus! Rishi is a pediatric infectious disease phys…
VideoFree13 minutes
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Biology: Gel electrophoresis
Introduction to gel electrophoresis. How it's used to separate DNA fragments or other macromolecules. Biology Life is beautiful! From atoms…
VideoFree11 minutes