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Khan Academy - Biology 1-48

Taxonomy and the Tree of Life
Taxonomy and the Tree of LifeThe science of taxonomy and where humans fit into the tree of lifeMore free lessons at: http://www.khanacademy.org/video?v=oHvLlS_Sc54From:Khan AcademyViews:285807 604ratingsTime:12:41More inEducation
- 2 Nov 11, 12:06am -
Species
SpeciesWhat a species is and isn't. Ligers, tiglons, mule, hinnies, and dogsMore free lessons at: http://www.khanacademy.org/video?v=Tmt4zrDK3dAFrom:Khan AcademyViews:155859 372ratingsTime:08:49More inEducation
- 1 Nov 11, 7:31pm -
Ape Clarification
Ape ClarificationApe Clarification - that they have no tailsMore free lessons at: http://www.khanacademy.org/video?v=oFGkYA_diDAFrom:Khan AcademyViews:407929 1165ratingsTime:01:04More inEducation
- 17 Mar 11, 5:31pm -
Correction to sodium-potassium pump video | Health & Medicine | Khan Academy
Correction to sodium-potassium pump video | Health & Medicine | Khan AcademyCorrection to "Sodium-potassium pump" video. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physio…
- 12 Jul 10, 1:04am -
Secondary active transport in the nephron | Renal system physiology | NCLEX-RN | Khan Academy
Secondary active transport in the nephron | Renal system physiology | NCLEX-RN | Khan AcademySecondary active transport in the nephron. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-renal-system/r…
- 3 Mar 10, 8:00pm -
The kidney and nephron | Renal system physiology | NCLEX-RN | Khan Academy
The kidney and nephron | Renal system physiology | NCLEX-RN | Khan AcademyOverview of how the nephrons in the kidney filter blood and reabsorb water and other molecules. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/tes…
- 3 Mar 10, 6:31pm -
Inflammatory response | Human anatomy and physiology | Health & Medicine | Khan Academy
Inflammatory response | Human anatomy and physiology | Health & Medicine | Khan AcademyOverview of the inflammatory response. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-p…
- 24 Feb 10, 7:58pm -
Review of B cells, CD4+ T cells and CD8+ T cells | NCLEX-RN | Khan Academy
Review of B cells, CD4+ T cells and CD8+ T cells | NCLEX-RN | Khan AcademyReview of B cells, CD4+ T cells and CD8+ T cells. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-immune-system/rn-the-immun…
- 19 Feb 10, 7:11pm -
Cytotoxic T cells | Immune system physiology | NCLEX-RN | Khan Academy
Cytotoxic T cells | Immune system physiology | NCLEX-RN | Khan AcademyHow cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.or…
- 19 Feb 10, 6:33pm -
Helper T cells | Immune system physiology | NCLEX-RN | Khan Academy
Helper T cells | Immune system physiology | NCLEX-RN | Khan AcademyIntroduction to helper T cells and their role in activating B cells. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-immune-system/…
- 19 Feb 10, 4:33am -
Professional antigen presenting cells (APC) and MHC II complexes | NCLEX-RN | Khan Academy
Professional antigen presenting cells (APC) and MHC II complexes | NCLEX-RN | Khan AcademyHow professional antigen presenting cells present parts of engulfed pathogens on MHC II complexes. Created by Sal Khan.Watch the next lesson: https://www…
- 18 Feb 10, 11:13pm -
B lymphocytes (B cells) | Immune system physiology | NCLEX-RN | Khan Academy
B lymphocytes (B cells) | Immune system physiology | NCLEX-RN | Khan AcademyOverview of B cells (B lymphocytes) and how they are activated and produce antibodies. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep…
- 18 Feb 10, 10:16pm -
Types of immune responses: Innate and adaptive, humoral vs. cell-mediated | NCLEX-RN | Khan Academy
Types of immune responses: Innate and adaptive, humoral vs. cell-mediated | NCLEX-RN | Khan AcademyInnate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Created by Sal Khan.Watch the next lesson: https://w…
- 18 Feb 10, 10:09pm -
Role of phagocytes in innate or nonspecific immunity | NCLEX-RN | Khan Academy
Role of phagocytes in innate or nonspecific immunity | NCLEX-RN | Khan AcademyRole of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. Created by Sal Khan.Watch the next lesson: https://www.kh…
- 18 Feb 10, 7:29pm -
Anatomy of a muscle cell
Anatomy of a muscle cellUnderstanding the structure of a muscle cellMore free lessons at: http://www.khanacademy.org/video?v=uY2ZOsCnXIAFrom:Khan AcademyViews:493711 1907ratingsTime:16:32More inEducation
- 16 Feb 10, 7:51pm -
Role of the sarcoplasmic reticulum in muscle cells | NCLEX-RN | Khan Academy
Role of the sarcoplasmic reticulum in muscle cells | NCLEX-RN | Khan AcademyThe role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell. Created by Sal Khan.Watch the next lesson: https://www.khanaca…
- 16 Feb 10, 6:11pm -
How tropomyosin and troponin regulate muscle contraction | NCLEX-RN | Khan Academy
How tropomyosin and troponin regulate muscle contraction | NCLEX-RN | Khan AcademyHow calcium ion concentration dictates whether a muscle contracts or not. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-r…
- 15 Feb 10, 9:34pm -
Myosin and actin | Circulatory system physiology | NCLEX-RN | Khan Academy
Myosin and actin | Circulatory system physiology | NCLEX-RN | Khan AcademyHow myosin and actin interact to produce mechanical force. . Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn-circulato…
- 15 Feb 10, 7:48pm -
Neuronal synapses (chemical) | Human anatomy and physiology | Health & Medicine | Khan Academy
Neuronal synapses (chemical) | Human anatomy and physiology | Health & Medicine | Khan AcademyHow one neuron can stimulate (or inhibit) another neuron at a chemical synapse. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org…
- 12 Feb 10, 6:55pm -
Electrotonic and Action Potentials
Electrotonic and Action PotentialsHow electrotonic and action potentials propagate down cellsFrom:Khan AcademyViews:374332 1031ratingsTime:18:53More inEducation
- 11 Feb 10, 11:59pm -
Sodium-potassium pump | Cells | MCAT | Khan Academy
Sodium-potassium pump | Cells | MCAT | Khan AcademyHow a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/cells/trans…
- 11 Feb 10, 11:09pm -
Anatomy of a neuron | Human anatomy and physiology | Health & Medicine | Khan Academy
Anatomy of a neuron | Human anatomy and physiology | Health & Medicine | Khan AcademyNeurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a c…
- 11 Feb 10, 11:09pm -
Hemoglobin | Human anatomy and physiology | Health & Medicine | Khan Academy
Hemoglobin | Human anatomy and physiology | Health & Medicine | Khan AcademyHemoglobin and its role in the circulatory system. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-…
- 10 Feb 10, 8:10pm -
Circulatory system and the heart | Human anatomy and physiology | Health & Medicine | Khan Academy
Circulatory system and the heart | Human anatomy and physiology | Health & Medicine | Khan AcademyIntroduction to the circulatory system and the heart. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/health-and-me…
- 10 Feb 10, 7:02pm -
Red blood cells | Human anatomy and physiology | Health & Medicine | Khan Academy
Red blood cells | Human anatomy and physiology | Health & Medicine | Khan AcademyOxygen uptake by hemoglobin in red blood cells. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-an…
- 10 Feb 10, 6:06pm -
The lungs and pulmonary system | Health & Medicine | Khan Academy
The lungs and pulmonary system | Health & Medicine | Khan AcademyThe pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm. Created by Sal Khan.Watch the next lesson: https://www.khanacademy…
- 9 Feb 10, 11:09pm -
Diffusion and osmosis | Membranes and transport | Biology | Khan Academy
Diffusion and osmosis | Membranes and transport | Biology | Khan AcademyLearn about diffusion, osmosis, and concentration gradients and why these are important to cells.Watch the next lesson: https://www.khanacademy.org/science/biology/membrane…
- 9 Feb 10, 12:51am -
Parts of a cell
Parts of a cellParts of a cell: nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, chloroplasts, vacuoles, and vesiclesAbout Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education f…
- 8 Feb 10, 9:55pm -
CAM Plants
CAM PlantsHow CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the dayMore free lessons at: http://www.khanacademy.org/video?v=xp6Zj24h8uAFrom:Khan AcademyViews:226892 618ratingsTime:08:…
- 5 Feb 10, 9:38pm -
C-4 Photosynthesis
C-4 PhotosynthesisC-4 Photosynthesis: How some plants avoid photorespirationMore free lessons at: http://www.khanacademy.org/video?v=7ynX_F-SwNYFrom:Khan AcademyViews:327373 1012ratingsTime:16:58More inEducation
- 5 Feb 10, 9:38pm -
Photorespiration
PhotorespirationMore detail on the Calvin Cycle and PhotorespirationMore free lessons at: http://www.khanacademy.org/video?v=EQvTEFCANTMFrom:Khan AcademyViews:257987 630ratingsTime:17:03More inEducation
- 5 Feb 10, 7:01pm -
Photosynthesis: Calvin Cycle
Photosynthesis: Calvin CycleThe Calvin Cycle or the light-independent (dark) reactions of photosythesisMore free lessons at: http://www.khanacademy.org/video?v=slm6D2VEXYsFrom:Khan AcademyViews:943915 2508ratingsTime:13:28More inE…
- 2 Feb 10, 8:43pm -
Photosynthesis: Light Reactions and Photophosphorylation
Photosynthesis: Light Reactions and PhotophosphorylationMore detail on the light reactions and photophorylationMore free lessons at: http://www.khanacademy.org/video?v=yfR36PMWeggFrom:Khan AcademyViews:515801 1444ratingsTime:18:51M…
- 2 Feb 10, 8:43pm -
Photosynthesis: Light Reactions 1
Photosynthesis: Light Reactions 1Details on the light-dependent reactions of photosynthesisMore free lessons at: http://www.khanacademy.org/video?v=GR2GA7chA_cFrom:Khan AcademyViews:1051008 3032ratingsTime:20:16More inEducation
- 2 Feb 10, 8:43pm -
Photosynthesis
PhotosynthesisOverview of photosythesisMore free lessons at: http://www.khanacademy.org/video?v=-rsYk4eCKnAAbout Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe…
- 2 Feb 10, 4:40pm -
Oxidative Phosphorylation and Chemiosmosis
Oxidative Phosphorylation and ChemiosmosisOxidative Phosphorylation and Chemiosmosis (along with slight correction of previous video)More free lessons at: http://www.khanacademy.org/video?v=W_Q17tqw_7AFrom:Khan AcademyViews:610063 1523…
- 12 Dec 09, 7:24pm -
Electron Transport Chain
Electron Transport ChainOverview of the Electron Transport ChainMore free lessons at: http://www.khanacademy.org/video?v=mfgCcFXUZRkAbout Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for any…
- 11 Dec 09, 10:43pm -
Krebs / citric acid cycle | Cellular respiration | Biology | Khan Academy
Krebs / citric acid cycle | Cellular respiration | Biology | Khan AcademyOverview of the Krebs or Citric Acid CycleWatch the next lesson: https://www.khanacademy.org/science/biology/cellular-respiration-and-fermentation/oxidative-phosphorylatio…
- 11 Dec 09, 7:01pm -
Overview of glycolysis | Cellular respiration | Biology | Khan Academy
Overview of glycolysis | Cellular respiration | Biology | Khan AcademyOverview of the basics of glycolysis.Watch the next lesson: https://www.khanacademy.org/science/biology/cellular-respiration-and-fermentation/glycolysis/v/glycolysis-overview…
- 10 Dec 09, 7:51pm -
Oxidation and reduction in cellular respiration | Biology | Khan Academy
Oxidation and reduction in cellular respiration | Biology | Khan AcademyOxidation and reduction in cellular respiration. Reconciling the biology and chemistry definitions of oxidation and reduction.Watch the next lesson: https://www.khanacademy…
- 10 Dec 09, 1:00am -
Oxidation and reduction review from biological point-of-view | Biomolecules | MCAT | Khan Academy
Oxidation and reduction review from biological point-of-view | Biomolecules | MCAT | Khan AcademyTaking a look at oxidation and reduction in a biological context. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/…
- 10 Dec 09, 1:00am -
Introduction to cellular respiration | Cellular respiration | Biology | Khan Academy
Introduction to cellular respiration | Cellular respiration | Biology | Khan AcademyIntroduction to cellular respiration, including glycolysis, the Krebs Cycle, and the electron transport chain.Watch the next lesson: https://www.khanacademy.org…
- 9 Dec 09, 2:23am -
ATP: Adenosine Triphosphate
ATP: Adenosine TriphosphateIntroduction to ATP or Adenosine TriphosphateFrom:Khan AcademyViews:720683 1996ratingsTime:13:35More inEducation
- 8 Dec 09, 8:57pm -
Viruses
VirusesIntroduction to virusesMore free lessons at: http://www.khanacademy.org/video?v=0h5Jd7sgQWYFrom:Khan AcademyViews:643084 2520ratingsTime:23:17More inEducation
- 4 Oct 09, 11:54pm -
Bacteria
BacteriaIntroduction to bacteriaMore free lessons at: http://www.khanacademy.org/video?v=TDoGrbpJJ14From:Khan AcademyViews:725406 2005ratingsTime:18:26More inEducation
- 2 Oct 09, 10:03pm -
Sex-linked traits | Biomolecules | MCAT | Khan Academy
Sex-linked traits | Biomolecules | MCAT | Khan AcademyChromosomal basis of sex. Sex-linked traits. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/biomolecules/chromosomal-inheritance/v/punnett-square-fun?u…
- 1 Oct 09, 7:27pm -
Hardy-Weinberg Principle
Hardy-Weinberg PrincipleUnderstanding allele and genotype frequency in population in Hardy-Weinberg Equilibrium.From:Khan AcademyViews:449822 1571ratingsTime:14:57More inEducation
- 30 Sep 09, 10:40pm -
Punnett square fun | Biomolecules | MCAT | Khan Academy
Punnett square fun | Biomolecules | MCAT | Khan AcademyDihybrid crosses. Independent assortment. Incomplete dominance. Codominance and multiple alleles. Created by Sal Khan.Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/biomo…
- 30 Sep 09, 9:40pm -

Khan Academy - Biology 49-62

Private video

- 12 Feb 10, 12:21am -
Introduction to Heredity
Introduction to HeredityHeredity and Classical Genetics. Dominant and recessive traits. Heterozygous and homozygous genotypes.More free lessons at: http://www.khanacademy.org/video?v=eEUvRrhmcxMFrom:Khan AcademyViews:593137 1253ratin…
- 30 Sep 09, 9:38pm -
Cancer
CancerAn introduction to what cancer is and how it is the by-product of broken DNA replicationMore free lessons at: http://www.khanacademy.org/video?v=RZhL7LDPk8wFrom:Khan AcademyViews:385864 1009ratingsTime:12:36More inEducation
- 30 Sep 09, 6:56pm -
Embryonic Stem Cells
Embryonic Stem CellsAn overview of early development of a zygote to an embryo. Embryonic and somatic stem cells.More free lessons at: http://www.khanacademy.org/video?v=-yCIMk1x0PkFrom:Khan AcademyViews:237796 620ratingsTime:19:55M…
- 30 Sep 09, 6:56pm -
Phases of Meiosis
Phases of MeiosisThe phases of Meiosis.More free lessons at: http://www.khanacademy.org/video?v=ijLc52LmFQgFrom:Khan AcademyViews:950890 3228ratingsTime:27:23More inEducation
- 24 Sep 09, 7:12pm -
Phases of Mitosis
Phases of MitosisExplanation of the phases of mitosis.More free lessons at: http://www.khanacademy.org/video?v=LLKX_4DHE3IFrom:Khan AcademyViews:977718 3243ratingsTime:20:42More inEducation
- 24 Sep 09, 3:43pm -
Evolution Clarification
Evolution ClarificationClarifying some points on evolution and intelligent designMore free lessons at: http://www.khanacademy.org/video?v=nh1R-gyY7esFrom:Khan AcademyViews:294392 854ratingsTime:09:01More inEducation
- 24 Sep 09, 12:00am -
Mitosis, Meiosis and Sexual Reproduction
Mitosis, Meiosis and Sexual ReproductionMitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.From:Khan AcademyViews:784607 2134ratingsTime:18:24More inEducation
- 23 Sep 09, 11:57pm -
Chromosomes, Chromatids, Chromatin, etc.
Chromosomes, Chromatids, Chromatin, etc.The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replicationMore free lessons at: http://www.khanacademy.org/video?v=s9HPNwXd9fkFrom:Khan AcademyViews:725196…
- 23 Sep 09, 11:57pm -
Variation in a Species
Variation in a SpeciesHow variation can be introduced into a species.More free lessons at: http://www.khanacademy.org/video?v=DuArVnT1i-EFrom:Khan AcademyViews:304796 624ratingsTime:19:52More inEducation
- 23 Sep 09, 11:57pm -
DNA
DNAAn introduction to DNAMore free lessons at: http://www.khanacademy.org/video?v=_-vZ_g7K6P0From:Khan AcademyViews:1262495 3433ratingsTime:28:06More inEducation
- 22 Sep 09, 6:29pm -
Natural Selection and the Owl Butterfly
Natural Selection and the Owl ButterflyHow the "Owl Butterfly" may have gotten the spot on its wings.More free lessons at: http://www.khanacademy.org/video?v=dR_BFmDMRaIFrom:Khan AcademyViews:264291 562ratingsTime:13:29More inEduca…
- 22 Sep 09, 6:29pm -
Intelligent Design and Evolution
Intelligent Design and EvolutionThe argument that evolution speaks to being the most "intelligent design"More free lessons at: http://www.khanacademy.org/video?v=qxOEz9aPZNYFrom:Khan AcademyViews:493722 3157ratingsTime:11:36More in…
- 22 Sep 09, 6:29pm -
Introduction to Evolution and Natural Selection
Introduction to Evolution and Natural SelectionIntroduction to evolution, variation in a population and natural selectionMore free lessons at: http://www.khanacademy.org/video?v=GcjgWov7mTMFrom:Khan AcademyViews:1312214 2766ratingsTim…
- 22 Sep 09, 6:28pm -