Digestive System, Part 2: Crash Course Anatomy & Physiology #34

Nearly 200 years ago, Alexis St. Martin was shot in the stomach. He was saved by local army doctor William Beaumont but had to live out his remaining years with a gaping hole in the stomach -- allowing Beaumont to learn a lot about how human digestion works. So today we're going to walk you through that process. We'll cover how mechanical and chemical digestion starts in the mouth and continues in the stomach, where it’s pummeled by acids and enzymes and turned into chyme. We will also go over the stomach’s cephalic, gastric, and intestinal phases of digestive regulation.

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

Chapters:
Introduction: Alexis St. Martin's Stomach Hole 00:00
Digestion Starts in the Mouth 2:45
The Stomach 4:37
Stomach Acid 5:38
Phases of Digestive Regulation: Cephalic, Gastric, and Intestinal 7:17
The Mind-Stomach Connection 8:55
Review 9:54
Credits 10:29

***

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark , Elliot Beter, Moritz Schmidt, Jeffrey Thompson, Ian Dundore, Jacob Ash, Jessica Wode, Today I Found Out, Christy Huddleston, James Craver, Chris Peters, SR Foxley, Steve Marshall, Simun Niclasen, Eric Kitchen, Robert Kunz, Avi Yashchin, Jason A Saslow, Jan Schmid, Daniel Baulig, Christian , Anna-Ester Volozh

--

Want to find Crash Course elsewhere on the internet?

[crashcourse]

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

[LifeIsForEmosD]

I have a feeling Beaumont WAS the hunter!!

[andrewdjburke]

I could learn to be a rocket scientist with this guy as my teacher.
You have the best method of teaching I have experienced thus far.
Please never stop making more science videos.

[angelalaplante]

What's the point in paying for college when you can learn more in 20 minutes than you learned in an entire semester.

[TheFireflyGrave]

St. Martin had a holy (hole-y) stomach. He's now the patron saint of the digestive system, the internet and all other tubes everywhere.

[NathanFales]

This video is more than I can stomach.

[SuperMissIsabelle]

I'm a medical student and after every lecture I always come here to understand better. You're the best!! Literally wouldn't pass my tests without you!

[alyssaatkinson]

It’s 2019(I’m aware this was posted a while ago), and I’m using this to help me with my science project and I just want to thank you for making these high quality videos that help educate people.

[NaturallyPrettyBrownK]

My mouth dropped after googling and finding out that the story between Sir Martin and Beaumont actually happened 😦

[KiloCharlie]

I watched this WHILE eating dinner...
I REGRET NOTHING!!!

[ryancspencer]

I watched this while eating, it was a very weird experience.

[SoccerBoi]

These videos are half the reason I have an A in Anatomy 2! Thanks Hank!

[ObbYzz]

First year at uni this is my only revision tool

[QUICKFACTS]

I watched crash course for my degree 💀

[mitchell]

Great video! Just a single correction I would do: Gastrin (6:55) is excrated in the blood, not in the stomach itself (gastrin is a hormon after all, not an enzyme)

[SuprDve]

My parents met while working at, and I and my brother were both born at, William Beaumont Hospital in Royal Oak, Michigan.

[HappiSweetPea]

If anyone wants more about St Martin and Beaumont, there is a Sawbones episode about it labeled The Gut Hole Romance. It's incredibly interesting.

[naisharao]

Very nice explanation of digestion . Thank you so much CRASH COURSE . You teach very well Hank . In a 10 minute video, all main concepts are explained .

[mkbashlorthecaredriver]

I just started watching this channel today to learn more about the digestive system, due to some recent medical issues I've had. This guy is so funny. I'm gonna keep going. Thank you!

[erilassila]

My digestive system is interesting. I've had chronic constipation since the age of three, and recently my number twos got drastically softer than usual, and my blood tests showed as if there was something wrong with my liver. I found out from a nurse (my mom) and a doctor we know, that it might be vitamin d deficiency. I got wonderfully skinny (waist circumference 81 cm) and started taking vitamin d regularly. it was really funny! I thought I was dying of liver cirrhosis and had to stop my favorite pastime (student parties) and it was just me forgetting to eat my vitamin d pills. Once I took my vitamins, my poop became harder and brown again. I actually found out what this whole poop shenanigan was, thanks to Hank and SciShow!