Hank tries not to stress you out too much as he delves into the functions and terminology of your sympathetic nervous system. Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZo Download it here for Android Devices: https://bit.ly/2SrDulJ Chapters: Introduction: Physiology of Stress 00:00 How Signals Travel to Effectors 1:48 Hormones & Neurotransmitters Communicate Stress 2:15 Preganglionic Fibers Release Acetylcholine (ACh) 3:42 Postganglionic Fibers Release Norepinephrine 4:34 Adrenal Glands Release Norepinephrine and Epinephrine as Hormones 5:10 Neurotransmitters vs. Hormones 6:01 How Norepinephrine Works: Alpha and Beta Receptors 6:29 Review 9:29 Credits 10:18 *** Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: Mark Brouwer, Simun Niclasen, Brad Wardell, Roger C. Rocha, Jan Schmid, Elliot Beter, Nevin Spoljaric, Sandra Aft, SR Foxley, Jessica Simmons, Stefan R. Finnerup, Jason A Saslow, Robert Kunz, Jessica Wode, Mike Drew, Steve Marshall, Anna-Ester Volozh, Christian Ludvigsen, Jeffrey Thompson, James Craver, Pankaj Gurung, Kelley Culp, Joshua McKee, Amory Olson: Kasson-Mantorville High School Science Instructor, Jack Thakar, Arrow Worthy, Magnus "Krox" Krokstad, Rachel Lee, Brian J. Rolf, Sylien -- 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: null