This animation demonstrates the behavior of a typical neuron at its resting membrane potential, and when it reaches an action potential and fires, transmitting an electrochemical signal along the axon. It shows how the various components work in concert: Dendrites, cell body, axon, sodium and potassium ions, voltage-gated ion channels, the sodium-potassium pump, and myelin sheaths. It also shows the stages of an action potential: Polarization, depolarization, and hyperpolarization. The animation was co-developed by Harvard Extension School's Office of Digital Teaching and Learning, and instructors for the courses in neurobiology and human anatomy. Learn more about Harvard Extension School: https://www.extension.harvard.edu/?utm_source=youtube&utm_medium=social&utm_campaign=ext_action-potential-in-the-neuron&utm_content=description

SUMMARY 1. Deoxygenated blood enters right atrium through Superior and Inferior Vena Cava 2. Blood enters right ventricle through tricuspid valve 3. Blood exits right ventricle through pulmonary valve and enters pulmonary artery 4. Left and right pulmonary arteries send blood to lungs, where gas exchange occurs 5. Oxygenated blood returns to heart via the pulmonary veins  enters left atrium 6. Blood enters left ventricle through mitral valve 7. Blood exits left ventricle through aortic semilunar valve to enter aorta 8. Aorta distributes blood to body 3D model from: https://www.cgtrader.com/3d-models/character/anatomy/human-body-anatomy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-biology/chemistry-of-life/elements-of-life/v/elements-and-atoms How elements relate to atoms. The basics of how protons, electrons and neutrons make up an atom. Watch the next lesson: https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/atomic-number-mass-number-and-isotopes?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful. About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channel/UCyEot66LrwWFEMONvrIBh3A?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-elements-and-the-periodic-table/x2613d8165d88df5e:isotopes-and-ions/v/introduction-to-ions An atom with an electric charge is called an ion. A positively charged ion (a cation) has more protons than electrons. A negatively charged ion (an anion) has more electrons than protons. Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc

To see all my Chemistry videos, check out http://socratic.org/chemistry This video is an introduction to ionic bonding, which is one type of chemical bonding. Ionic bonds hold together metal and nonmetal atoms. In ionic bonding, electrons are transferred from a metal atom to a nonmetal atom, creating ions. These ions have opposite charge, so they stick together. Creative Commons Attribution-NonCommercial CC BY-NC

In this video you'll learn the basics about Ionic Bonds. SUPPORT US ON PATREON https://www.patreon.com/fuseschool SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Find all of our Chemistry videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV Find all of our Biology videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0 Find all of our Physics videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTWm6Sr5uN2Uv5TXHiZUq8b Find all of our Maths videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTKBNbHH5u1SNnsrOaacKLu Instagram: https://www.instagram.com/fuseschool/ Facebook: https://www.facebook.com/fuseschool/ Twitter: https://twitter.com/fuseSchool Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Follow us: http://www.youtube.com/fuseschool Befriend us: http://www.facebook.com/fuseschool This is an Open Educational Resource. If you would like to use the video, please contact us: info@fuseschool.org

Introduction to ionic, covalent, polar covalent and metallic bonds. Watch the next lesson: https://www.khanacademy.org/science/chemistry/chemical-bonds/types-chemical-bonds/v/electronegativity-trends?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Missed the previous lesson? https://www.khanacademy.org/science/chemistry/periodic-table/periodic-table-trends-bonding/v/metallic-nature-trends?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful. About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channel/UCyEot66LrwWFEMONvrIBh3A?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy

Introduction to pH and the pH scale. Examples of calculating pH of pure water, bleach, and orange juice. Watch the next lesson: https://www.khanacademy.org/science/biology/water-acids-and-bases/acids-bases-and-ph/v/buffer-system?utm_source=YT&utm_medium=Desc&utm_campaign=biology Missed the previous lesson? https://www.khanacademy.org/science/biology/water-acids-and-bases/acids-bases-and-ph/v/bronsted-lowry-definition-of-acids-and-bases?utm_source=YT&utm_medium=Desc&utm_campaign=biology Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the many branches of biology and why they are exciting and important. Covers topics seen in a high school or first-year college biology course. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy's Biology channel: https://www.youtube.com/channel/UC82qE46vcTn7lP4tK_RHhdg?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy

Paul Andersen explains pH as the power of hydrogen. He explains how increases in the hydronium ion (or hydrogen ion) concentration can lower the pH and create acids. He also explains how the reverse is true. An analysis of a strong acid and strong base is also included. Intro Music Atribution Title: I4dsong_loop_main.wav Artist: CosmicD Link to sound: http://www.freesound.org/people/CosmicD/sounds/72556/ Creative Commons Atribution License All images are either Public Domain or Creative Commons Attribution Licenses: Bordercolliez. English: A Roll of Universal Indicator Paper., June 23, 2011. Own work. http://commons.wikimedia.org/wiki/File:Universal_indicator_paper.jpg. "File:Myoglobin.png." Wikipedia, the Free Encyclopedia. Accessed April 30, 2013. http://en.wikipedia.org/wiki/File:Myoglobin.png. "File:WOA05 GLODAP Del pH AYool.png." Wikipedia, the Free Encyclopedia. Accessed April 30, 2013. http://en.wikipedia.org/wiki/File:WOA05_GLODAP_del_pH_AYool.png. Slower. pH Scale Showing Common Substances, 2006. Own work. http://commons.wikimedia.org/wiki/File:PH_scale.png.

Explore the steps of DNA replication, the enzymes involved, and the difference between the leading and lagging strand! This video is an update from our old DNA replication video with nearly the same script but added detail and improved art! See table of contents by expanding details. Table of Contents: 00:00 Intro 0:11 Why do you need DNA replication? 0:27 Where and when? 1:12 Introducing key player enzymes 2:48 Initial steps of DNA Replication 4:04 Explaining 5' to 3' and 3' to 5' 5:09 Showing leading and lagging strands in DNA replication Video has a handout here: http://www.amoebasisters.com/handouts Factual Reference: OpenStax, Biology. OpenStax CNX. May 8, 2019 http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@11.10. ***Further Reading Suggestions*** -More info about prokaryote vs. eukaryote DNA Replication? (Which video doesn't go into) Check out the bottom of this page of the peer-reviewed, FREE OpenStax testbook: https://cnx.org/contents/GFy_h8cu@11.10:2l3nsfJK@5/DNA-Replication-in-Eukaryotes -More detail about DNA replication, including the different types of polymerase? Check out this page of the peer-reviewed, FREE OpenStax textbook: https://cnx.org/contents/GFy_h8cu@11.10:NEk9ll-3@8/DNA-Replication-in-Prokaryotes -Check out this science paper that details how cancer drugs can work to stop DNA replication in cancer cells. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5797825/ The Amoeba Sisters videos demystify science with humor and relevance. The videos center on Pinky's certification and experience in teaching biology at the high school level. Amoeba Sisters videos only cover concepts that Pinky is certified to teach, and they focus on her specialty: secondary life science. Learn more about our videos here: https://www.amoebasisters.com/our-videos ⭐ Our Linktree: https://linktr.ee/amoebasisters ❤️ Support Us? https://www.amoebasisters.com/support-us 🗂️ Resources that complement our videos! Visit https://docs.google.com/spreadsheets/d/1b3kmAzFEjWgoMKCrkeNCKFYunWk04IuLY93jI4OY0gY/edit?usp=sharing Biology Video Playlist: https://www.youtube.com/playlist?list=PLwL0Myd7Dk1F0iQPGrjehze3eDpco1eVz TIPS FOR VIEWING EDU YOUTUBE VIDEOS: Want to learn tips for viewing edu YouTube videos including changing the speed, language, viewing the transcript, etc? https://www.amoebasisters.com/pinkys-ed-tech-favorites/10-youtube-tips-from-an-edu-youtuber-duo MUSIC: Our intro music designed and performed by Jeremiah Cheshire. End music in this video is listed free to use/no attribution required from the YouTube audio library https://www.youtube.com/audiolibrary/music?feature=blog COMMUNITY: We take pride in our AWESOME community, and we welcome feedback and discussion. However, please remember that this is an education channel. See YouTube's community guidelines and how YouTube handles comments that are reported by the community. We also reserve the right to remove comments. TRANSLATIONS: Hindi Subtitles Credit: Alisha Aggarwal Some translated subtitles on our videos were translated by the community using YouTube's community-contributed subtitle feature. After the feature was discontinued by YouTube, we have another option for submitting translated subtitles here: https://www.amoebasisters.com/pinkys-ed-tech-favorites/community-contributed-subtitles We want to thank our amazing community for the generosity of their time in continuing to create translated subtitles. If you have a concern about community contributed contributions, please contact us. We have videos dubbed in Spanish and Portuguese using an artificial voice via https://aloud.area120.google.com to increase accessibility. See our Amoeba Sisters en Español channel https://www.youtube.com/channel/UC1Njo3LBy53cOPngz6ArV8Q and Amoeba Sisters em Português https://www.youtube.com/channel/UCYTQPX2X_mXe0ZMPi0fXxbg

Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environment and in the food that we eat. Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids

https://xvivo.com/examples/the-inner-life-of-the-cell/ Learn more about this animation on our website Harvard University selected XVIVO to develop an animation that would take their cellular biology students on a journey through the microscopic world of a cell, illustrating mechanisms that allow a white blood cell to sense its surroundings and respond to an external stimulus. This award winning piece was the first topic in a series of animations XVIVO is creating for Harvard's educational website BioVisions at Harvard. http://www.xvivo.net http://multimedia.mcb.harvard.edu/

Explore the types of passive and active cell transport with the Amoeba Sisters! This video has a handout here: http://www.amoebasisters.com/handouts.html Expand video details for table of contents 👇 Table of Contents: Intro 00:00 Importance of Cell Membrane for Homeostasis 0:41 Cell Membrane Structure 1:07 Simple Diffusion 1:45 What does it mean to "go with the concentration gradient?" 2:20 Facilitated Diffusion 2:38 Active Transport 4:53 (including endocytosis 5:36 exocytosis 6:36) Transport types covered include simple diffusion, facilitated diffusion, endocytosis, and exocytosis. REFERENCE: We cover the basics in biology concepts at the secondary level. If you are looking to discover more about biology and go into depth beyond these basics, our recommended reference is the FREE, peer reviewed, open source OpenStax biology textbook: https://openstax.org/details/books/biology -------------------------------------------------------------------- Biology Video Playlist: https://www.youtube.com/playlist?list=PLwL0Myd7Dk1F0iQPGrjehze3eDpco1eVz The Amoeba Sisters videos demystify science with humor and relevance. The videos center on Pinky's certification and experience in teaching biology at the high school level. Amoeba Sisters videos only cover concepts that Pinky is certified to teach, and they focus on her specialty: secondary life science. Learn more about our videos here: https://www.amoebasisters.com/our-videos ⭐ Our Linktree: https://linktr.ee/amoebasisters 🗂️ Resources that complement our videos! Visit https://docs.google.com/spreadsheets/d/1b3kmAzFEjWgoMKCrkeNCKFYunWk04IuLY93jI4OY0gY/edit?usp=sharing ❤️ Support Us? https://www.amoebasisters.com/support-us TIPS FOR VIEWING EDU YOUTUBE VIDEOS: Want to learn tips for viewing edu YouTube videos including changing the speed, language, viewing the transcript, etc? https://www.amoebasisters.com/pinkys-ed-tech-favorites/10-youtube-tips-from-an-edu-youtuber-duo MUSIC: Music in this video is listed free to use/no attribution required from the YouTube audio library https://www.youtube.com/audiolibrary/music?feature=blog COMMUNITY: We take pride in our AWESOME community, and we welcome feedback and discussion. However, please remember that this is an education channel. See YouTube's community guidelines and how YouTube handles comments that are reported by the community. We also reserve the right to remove comments. TRANSLATIONS: Some translated subtitles on our videos were translated by the community using YouTube's community-contributed subtitle feature. After the feature was discontinued by YouTube, we have another option for submitting translated subtitles here: https://www.amoebasisters.com/pinkys-ed-tech-favorites/community-contributed-subtitles We want to thank our amazing community for the generosity of their time in continuing to create translated subtitles. If you have a concern about community contributed contributions, please contact us. UPDATE: We have videos dubbed in Spanish and Portuguese using an artificial voice via https://aloud.area120.google.com to increase accessibility. See our Amoeba Sisters en Español channel https://www.youtube.com/channel/UC1Njo3LBy53cOPngz6ArV8Q and Amoeba Sisters em Português https://www.youtube.com/channel/UCYTQPX2X_mXe0ZMPi0fXxbg Want to help translate our subtitles in any language? Learn more here https://www.amoebasisters.com/pinkys-ed-tech-favorites/community-contributed-subtitles

Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. "Concert" music used with permission from Chameleon Circuit. This video uses sounds from Freesound.org Table of Contents time codes: 1) Passive Transport - 1:17 2) Diffusion - 1:25 3) Osmosis - 2:12 4) Channel Proteins- 4:37 5) Active Transport - 4:58 6) ATP - 5:37 7) Transport Proteins - 6:19 8) Biolography - 6:37 9) Vesicular Transport - 9:02 10) Exocytosis - 9:21 11) Endocytosis - 9:50 12) Phagocytosis - 9:57 13) Pinocytosis - 10:29 14) Receptor-Mediated Endocytosis - 10:48 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids

Drew Berry is a biomedical animator whose scientifically accurate and aesthetically rich visualisations reveal the microscopic world inside our bodies to a wide range of audiences. His animations have exhibited at venues such as the Guggenheim Museum, Museum of Modern Art (New York), the Royal Institute of Great Britain and the University of Geneva. In 2010 he received a MacArthur Fellowship "Genius Award". http://tedxsydney.com/site/newSpeakers.cfm#DrewBerry ------------------- TEDxSydney 2011 took place on Saturday 28 May 2011 at CarriageWorks. Tens of thousands of people enjoyed the day: 800 in the theatre, over 1,000 via big screen simulcast in The Forum, up to 48,000 online via YouTube ... and up to 80,000 tuning in to ABC Radio National. It was a grand day. About TEDx, x = independently organised event In the spirit of ideas worth spreading, TEDx is a program of local, self-organised events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organised events are branded TEDx, where x = independently organised TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organised.* (*Subject to certain rules and regulations)