Sympathetic Nervous System: Crash Course Anatomy & Physiology #14

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!

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

--

Want to find Crash Course elsewhere on the internet?

[smiggenluva]

I'm procrastinating doing science homework with more science. Oh my.

[grandmodesty]

Psych professor: So I found this series called Crash Course, this is your homework for tonight.

Oh thank the heavens.

[angelpirtle]

7 years later and this video is still so helpful!

[wolfrox]

Man it really sucks the body can't tell the difference, I remember going into some exams with my heart racing as if my life was on the line.

[TheInternetcord]

These videos are just so original and professional, so easy to learn from and enjoyable! THANK YOU CRASHCOURSE STAFF!

[yemen]

My trick to remembering" Beta Receptors" is "Be Relaxed" 😅

[laurasteinemannzimmerman]

BLESS YOU HANK. Thank you seriously. This makes SO much more sense. The visuals are GREAT and you really make this so much simplier than the text books. I have been PULLING out my hair and now I feel so much better about this material.

[elizabethschmied]

My anatomy professor is the consultant for A&P Crash Course videos!!!!

[savannahm]

He had me at “I’m not talking about the “my iPhone just died kind of stress.” I’m talking the “I might die kind of stress.” 🤣🤣

[alf]

You might even say, *click*, stressful. This is why we love you Hank. Thanks to you and all your colleagues for making these videos. I cannot express my level of gratitude in words. :)

[thescarynymph]

The graphics are getting really good! Very detailed and sharp. Props to Thought Cafe!!!

[AssClappicus]

Vital clarification of the difference between a hormone and a neurotransmitter. Great episode, as always. Thanks guys!

[AJarOfYams]

"Your burrito can wait! Get out of the house!"
- #HankGreen2015

[crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

[aramisfarias]

This episode was really great! I could completly follow the pace and learn stuff. Thanks Crash Course Team. You people are great.

[liliumjade]

I cracked up when the little person's legs started running lol!

[melliemel]

This just came in handy for the physiology paper I had to write about stress. APA cited you Hank :)

[xJUHz]

18 years old and had my first burnout from all the stress. Id have to say it was not a fun experience, but i learned alot, i feel somewhat grown up and know how to get things done.

No more stress cancer. I am steady as a rock.

[MarioFan]

This was a very interesting episode. I really appreciate all the hard work y'all do educating us on anatomy and physiology because I really think it's relevant and important for people to know about this kind of stuff. Keep 'em coming!

[madisoncampbell]

Thanks for the video Hank! Can you talk more about adrenaline/nor adrenaline and muscarinic receoptors? And the different subtypes eg. alpha 1 and 2 and beta 1 and 2