Khan Academy
DNA
The picture of the DNA double helix provides a logical start to describing how the base pairs match up and how the order codes for a chain of protein molecules—three billion of these base pairs code for any protein present in your body....
Khan Academy
Hemoglobin, Human Anatomy and Physiology, Health and Medicine
If Hemoglobin and Red Blood Cells play an essential role in your curriculum or have piqued your students' interest, then this video would be an asset for understanding that higher acidity and Carbon Dioxide play an allosteric inhibition...
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Role of the Sarcoplasmic Reticulum in Muscle Cells, NCLEX-RN
Many of the concepts mentioned as an aside in previous videos are reintroduced here. By listening to Salman's recap of an action potential, students will understand how a nerve impulse can stimulate the release of neurotransmitters which...
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C-4 Photosynthesis
Comparisons between C3 and C4 photosynthesis begin in this video. Next, the mechanism by which CO2 is incorporated into a 4-carbon compound is explained. This is an involved topic which can be very complicated. It should be an excellent...
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Punnett Square Fun, Biomolecules, MCAT
The topics in the previous video about dominant and recessive traits are continued here as Sal Khan explains incomplete dominance, the randomness of genotypes and phenotypes, and covers how to calculate probabilities using Punnett...
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Cytotoxic T Cells, Immune System Physiology, NCLEX-RN
Sal explains how every cell in our body can present a sample of the proteins inside it, in order to signal that it is compromised. A concise summary to help students understand the complex system of alerting a T cell and initiating the...
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Glucose Insulin and Diabetes
This video would be great to use as an introduction to diabetes and the concepts of glucose, insulin levels, and their relationship. The differences between Type I and Type II are explained, as are the basic methods of treating the...
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Correction to Sodium-Potassium Pump Video, Health and Medicine
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...
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Embryonic Stem Cells, Cells, MCAT
A presentation which concentrates on the development of the blastocyst and embryo after fertilization. Topics begin with the scientific names and processes at each stage and then develop into an explanation of embryonic and somatic stem...
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Viruses
High school science classes will find this video intriguing. Viruses contain genetic information, but there are strong arguments for whether viruses are living or not. Replication versus metabolism, as well as some details about the...
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Helper T Cells, Immune System Physiology, NCLEX-RN
The main concepts covered in this video are the complex procedures that follow the recognition of a foreign body by the immune system. Sal describes the roles of helper T cells and memory cells in controlling future responses.
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Neuronal Synapses (Chemical), Human Anatomy and Physiology, Health and Medicine
Lecture time is mainly spent explaining the concept of voltage potentials 'jumping' across synapses, as well as providing more details about ion pumps and protein vesicles involved in neurotransmitters.
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Secondary Active Transport in the Nephron, Renal System Physiology, NCLEX-RN
The details of nephron structure and the importance of renal tubules in osmosis, reabsorption, and secretion of solutes, and the related concentration of the final filtrate.
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Heart Disease and Heart Attacks
Using diagrams and photos, Salman Khan can effectively differentiate and clarify the distinction between the blockage of systemic arteries and the blockage of coronary arteries.
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Photorespiration
Salman Khan delves further into the Calvin Cycle (light-independent reactions). This presentation presents the information at a college level.
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Thromboemboli and Thromboembolisms
This presentation clarifies the explanations of thrombi and emboli from previous videos and differentiates between the different types of clots.
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Oxidative Phosphorylation and Chemiosmosis
Salman Khan reinforces the balancing of the equation through the electron transport chain and then elaborates on relevant vocabulary.
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Inflammatory Response, Human Anatomy and Physiology, Health and Medicine
Sal describes the cellular activity that occurs when there is damage to our membranes.
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CAM Plants
This lecture continues the concept of CO2 being stored in the form of acid before it is used in photosynthesis.
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Chilling Water Problem, States of Matter and Intermolecular Forces, Chemistry
Sal continues this short series on specific heat and vaporization. The situation he poses uses 500 grams of liquid water at 60 degrees Celsius to get the water to zero degrees Celsius. The ice he adds to the water comes out at -10...
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Vapor Pressure, States of Matter and Intermolecular Forces, Chemistry
Vapor pressure is the focus of this chemistry video. Sal explains that when molecules are "sticking together," a substance takes on a liquid or solid form. However, when kinetic energy increases, the molecules are forced apart, allowing...
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The Mole and Avogadro's Number, Atomic Structure and Properties, AP Chemistry
Sal introduces chemistry students to the concept of "moles." He points out that a mole is a unit of measurement that helps a student to convert between grams and atomic mass units of any substance. Sal uses the element Aluminum to...
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Entropy Intuition, Thermodynamics, Physics
Sal provides two definitions for entropy: the thermodynamic definition and the mathematical definition. Entropy and the 2nd Law of Thermodynamics are the focus of this chemistry video. The law states that the change in entropy in the...
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States of Matter, States of Matter and Intermolecular Forces, Chemistry
The three states of matter are the focus of this chemistry video. Sal uses the example of a water molecule and explains in great detail the forces present that allow the molecule to change between a liquid, a solid, and a gas. Of course,...