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

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Published 2015-09-14

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.

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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

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All Comments (21)

@crashcourse 3 years ago

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: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ
@LifeIsForEmos8D 8 years ago

I have a feeling Beaumont WAS the hunter!!
@andrewdjburke 5 years ago

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.
@angelalaplante1451 5 years ago

What's the point in paying for college when you can learn more in 20 minutes than you learned in an entire semester.
@sanjaymahajan2202 7 years ago

I watch crash course for my exams
@NathanFales 8 years ago

This video is more than I can stomach.
@TheFireflyGrave 8 years ago

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.
@SuperMissIsabelle 2 months ago

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!
@Kilo6Charlie 8 years ago

I watched this WHILE eating dinner... I REGRET NOTHING!!!
@NaturallyPrettyBrownK26 5 years ago

My mouth dropped after googling and finding out that the story between Sir Martin and Beaumont actually happened 😦
@ryancspencer999 6 years ago

I watched this while eating, it was a very weird experience.
@alyssaatkinson7029 5 years ago

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.
@SoccerBoi500 8 years ago

These videos are half the reason I have an A in Anatomy 2! Thanks Hank!
@QUICKFACTS247 1 year ago

I watched crash course for my degree 💀
@Sup3rD4ve 5 years ago

My parents met while working at, and I and my brother were both born at, William Beaumont Hospital in Royal Oak, Michigan.
@123ObbYzz 7 years ago

First year at uni this is my only revision tool
@mitchell186199 7 years ago

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)
@ahsanzahid718 7 years ago

So how does St.Martin take a shower
@HappiSweetPea 4 years ago

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 5 years ago

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 .