Hank tries not to stress you out too much as he delves into the functions and terminology of your sympathetic nervous system.
Table of Contents
Sympathetic Nervous System Controls the Body's Stress Response 0:26
How Signals Travel to Effectors 1:48
Acetylcholine in the Ganglion 3:55
Norepinephrine at the Effector 4:42
Norepinephrine and Epinephrine Are Secreted as Hormones 5:35
Alpha Receptors Cause Smooth Muscles to Constrict 7:14
Beta Receptors Cause Smooth Muscles to Relax 7:27
Crash Course is now on Patreon! You can support us directly (and, until April 30th, have your contributions matched by Patreon!) by signing up at www.patreon.com/crashcourse
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
I love you so much, stay awesome as always!
TO: Josiah P.
FROM: Amy P.
I love you!
***SUPPORTER THANK YOU!***
Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:
Amory Olson: Kasson-Mantorville High School Science Instructor
Magnus "Krox" Krokstad
Brian J. Rolf
Want to find Crash Course elsewhere on the internet?
Facebook - www.facebook.com/YouTubeCrashCourse
Twitter - www.twitter.com/TheCrashCourse
Tumblr - thecrashcourse.tumblr.com
Support Crash Course on Patreon: patreon.com/crashcourse
CC Kids: www.youtube.com/crashcoursekids
In this Crash Course series, Hank Green teaches most of what you should know about anatomy and physiology, perfect for a freshman-level biology course, or just your own curiosity about the human body.