Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 9)
Have your class work through exercises focused on number patterns with place value. Present each problem, allow your class to work through it, and then show them what Sal did to solve each problem. Every problem is completely explained...
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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....
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Balancing Chemical Equations
Students are introduced to the process of balancing chemical equations. First, they see that a chemical equation describes the chemical reaction that takes place when two elements are combined. In chemistry, that reaction must be written...
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Number Sets, Fractions, Pre-Algebra
Knowing mathematic terminology is vital for building a functional academic vocabulary. In this video, Sal defines number sets and the terms natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers....
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Dividing Fractions
Here is an example problem that requires Sal to divide by the reciprocal. He demonstrates dividing the fraction and rewriting it as a mixed number. Sal nicely explains why multiplying a fraction is the same as dividing it by its reciprocal.
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Permutations
This video is an introduction to permutations. Sal shows two examples, defines the mathematical notation for permutations, and derives a formula for finding a permutation without repetition of choices. He tries to convey an intuitive...
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Combinations
How many different ways can five people be arranged in any order in three chairs? Sal shows how combinations are different than permutations. He derives the formula for finding the combination without repetition.
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Introduction to Heredity
Young scientists generally love to learn how certain traits can be explained by a direct combination of alleles from their parents. Here, they can examine how a phenotype is often expressed when one allele is recessive and the other is...
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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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Overview of Glycolysis, Cellular Respiration, Biology
If you need a summary of respiration, then these three videos will be invaluable to your class. The actual reactions that occur at the three stages of respiration are explained step-by-step, with an explanation of every chemical bond...
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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...
Khan Academy
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.
Khan Academy
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.