Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disorder that mainly affects the nerve cells (neurons), which control muscle movement. As the motor neurons degenerate, they stop sending signals to the muscles, causing progressive muscle weakness and — ultimately — death. This animation focuses on the mechanisms within the motor neurons that cause them to degenerate. By understanding these mechanisms, researchers hope to one day find a cure for ALS. To learn more about ALS, check out the Primer: https://www.nature.com/articles/nrdp201771 and the PrimeView: https://www.nature.com/articles/nrdp201772 Nature Research has full responsibility for all editorial content, including Nature Video content. This content is editorially independent of sponsors.

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Created by Nauroz Syed. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-reproductive-system-physiology/rn-pregnancy/v/placenta-accreta?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/rn-reproductive-system-physiology/rn-pregnancy/v/placenta-previa?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at http://creativecommons.org/licenses/by-nc-sa/3.0/us/). 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 NCLEX-RN channel: https://www.youtube.com/channel/UCDx5cTeADCvKWgF9x_Qjz3g?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy

How to Study Better and Get Better Grades: Learn how to study smarter and more efficiently, which translates to better grades and more free time for the things you enjoy. These are the study strategies and tips I wish I had known in college, as they would have made my life much easier. This video will help you improve your grades and have you spend less time studying! In medical school you are forced to learn information at a faster pace than in undergrad. In this video I go over the various strategies that helped me study more effectively and efficiently, and what I wish I knew during undergrad as a premed student. Life would have been much easier and I would have had more time to do other things if I knew these study tricks earlier. Pens I used: http://geni.us/cgBEfE In this video, I help go over key strategies that will help premedical students excel in their courses and help gain admission to medical school. I cover: 1) Active vs Passive learning 2) Learning Environment 3) How to obtain information from lectures and textbooks 4) How to review information 5) Simple principles for test day WEBSITE: https://medschoolinsiders.com TWITTER: https://twitter.com/MedInsiders FACEBOOK: https://www.facebook.com/medschoolinsiders INSTAGRAM: https://www.instagram.com/medschoolinsiders

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Created by Nauroz Syed. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-reproductive-system-physiology/rn-pregnancy/v/utis-in-pregnancy?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/rn-reproductive-system-physiology/rn-pregnancy/v/placental-abruption?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at http://creativecommons.org/licenses/by-nc-sa/3.0/us/). 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 NCLEX-RN channel: https://www.youtube.com/channel/UCDx5cTeADCvKWgF9x_Qjz3g?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy