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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.
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.
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)
Um... yeah. If someone was that desperate to find me they could without the comment. It’s not like I said what floor I work on and the hours I’m there. It’s a BIG hospital with lots of security. Plus there are 3 Beaumont’s in Troy so come find me 😂😂
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!
8:35 is why IBS can be so problematic for some people. Stress makes me feel like I'm being stabbed in the gut, I have to spend hours on the toilet and eat only bland things. It's not fun, I'm glad I'm now taking anxiety medicine.
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 .
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!
I'm loving this subsection of a&p. My physiology class didn't go into much detail, and I love the digestive system. I do wish the lack of knowledge about vomit was acknowledged.
Thanks a lot! Sir your videos make it so much easier to learn such complex topics. I'm in class 8 now but I still can understand it quite well. Kudos to you and your team!!!
8:33 - "If you are super anxious, [...] you're sympathetic nervous system will also inhibit gastric secretion [...]" "You're" instead of "your" in scishow? Woah.
+Kehla Martri It wasn't clear, because my resolutions not very good today, but I think it also had effect (noun) where it should have been affect (verb).
Crash course is going so well I have watched crash course biology 😍😍😍😍 it helped me a lot to clear my tests n now A &P is equally fantastic Hank Green is just awesome. ....God bless that guy
dude I study medicine and when I first clicked on this video I thought "Oh well it's just a cartoon thing - it can't be that detailed" and I was amazed by all the things he said: It's all correct and so detailed and just on a really high niveau of education while explainig it very simple :D
Bryan Cotto But Hank... oh my God, he just rambles on before the intro even plays, EVERY TIME. Every time while everyone else (That I watch on CC) just says a short thing, like a pun or short bit of info for 10-20 seconds and then let the intro play, then get to the point. Hank, though... HE JUST GIVES AN ENTIRE SUMMARY AND SPEECH BEFORE IT STARTS! XD
Crash course, I was wondering if you had like a basic summary of the whole digestive system or any other systems, because I am taking down notes. Thank you
As a former bulimic, I can confirm that the stomach can hold a gallon of food or more. In fact, I think it can hold 2-3 gallons of food, because I remember filling a five gallon bucket with vomit in two consecutive binges-purge session.
6:11 lol. I love how they animated a chicken leg inside his coffee cup. This video reminds me of fistulated cows that are used to study their digestion.
Oh my bloody god @ the 08:32 your vs you're. I thought this was my favorite EDUCATIONAL channel, not one where the one single most appalling error feels at home.
Im wondering why vomiting can be caused by a miscommunication in the brain, like how car sickness is caused by your body saying "I'm sitting still" and your visual cortex saying "were on the move" I'm guessing it's an adaptation to poisons? Poisons can cause miscommunication therefor the body will try remove them from the body. I'm just speculating if anyone has a definitive answer please let me know
Its not necessarily a miscommunication, its more just your body is getting ready for the fight/flight and so what happens is you don't want stuff in your stomach being digested and potentially using up energy that could be used in your fight/flight
Is it strange that I found this more fascinating than the Nebulae video on CrashCourse Astronomy? Actually this is one of the most fascinating videos I've ever seen from CrashCourse.
If your nervous your sympathetic nervous system will inhibit gastric secretion was the biggest take away for me. I remember when I was younger id get nervous/anxious in certain situations and loose all my appetite and suddenly my bowels/bladder felt like they had to get rid of everything in my body. Was really SHIT.
In my language (which is Dutch) we also use the word "bolus", but here it means turd... So the same word, but for the thing that comes out of your digestive system, and not for what goes in it. At least I hope... o.O
Digestive system Ingestion Propulsion Mechanical breakdown Chemical digestion Absorption Defecation Mouth Pharynx Oesophagus Stomach Liver Gallbladder Pancreas Small intestine Large intestine Food is made of macromolecules theses macromolecules include carbs, lipids, proteins and nucleic acids. These macromolecules are polymers (sequences of smaller molecules put together). Cells can only take in a polymers individual component (monomers). Monomers include Fatty acids, sugars, amino acids and nucleotides. The whole point of the digestive system is to break down polymers into monomers that the body can use to make its own polymers and obtain energy from. Alimentary canal (gastrointestinal tract) runs from your mouth to your anus As food enters the mouth both mechanical and chemical digestion occurs. The teeth (incisors, canines, premolars and molars) crush and cut food and is an example of mechanical digestion. Chemical digestion takes place as amylase which breaks down carbs is released through saliva. After the bolus (chewed food) is swallowed it travels past the pharynx, down the oesophagus where through muscle movements (peristalsis) the bolus reaches the stomach. The stomach has four layers in its lining from outermost to innermost the mucosa, submucosa, muscularis externa and serosa. The muscularis includes an additional layer of smooth muscle for mechanical digestion and the inner mucosa is almost entirely made up of mucous cells which produce a protective mucous to keep the stomach safe from acids. The lining contains millions of gastric pits which lead to tubular gastric glands which contain various secretory cells which create potent chemicals. For example parietal cells in the tubular gastric glands release hydrochloric acid to kill bacteria and denature proteins for easier breakdown from enzymes. When hydrochloric acid is combined with the inactive enzyme pepsinogen made by chief cells the combination results in pepsin.Pepsin is a powerful enzyme that breaks down proteins. Enteroendocrine cells in the tubular gastric glands release regulatory hormones, like serotonin and histamine to trigger the release of more acid by other cells or to contract muscle tissue. When needed somatostatin is released to inhibit secretions. G cells secrete gastrin which stimulates the release of other gastric fluids and controls muscle activity.
