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Blood Vessels, Part 2: Crash Course Anatomy & Physiology #28
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- Опубликовано: 31 июл 2024
- And now we return to blood vessels. In this episode, we start discussing what blood pressure is, how it can become "high", and what that means for our health. One of the more interesting points is that your body has ways of dealing with high blood pressure, but they're not ways we want our bodies to operate on a full-time basis. And why can't we butter our bacon? WHY!?!?!
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
Chapters:
Introduction: High Blood Pressure 00:00
Cardiac Output - How Blood Flows 1:36
Blood Pressure & Resistance 2:17
Blood Flow Formula 3:07
Short Term Blood Pressure Regulation 3:54
Long Term Blood Pressure Regulation 5:44
Chronic High Blood Pressure 6:22
Review 8:15
Credits 8:42
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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
CrashCourse already downloaded it, it’s exactly what I wanted
Hank are you single? I am and I could listen to these courses allllllll dayyyyyyy lol
Just trying to study for my A&P exam and now I'm terrified about my health lol
5 months later so hope your test went well
This'll probably sound really weird, but I feel like learning about biology really helps you to have a positive body image.
In my case at least, the more I learn about human anatomy/physiology, the harder it is for me to see my body as anything other than this incredibly complex 'machine' that needs to be cared for. Whereas before, I'd have looked at my reflection and noticed so many flaws I can barely count them, I now can't help but admire how all of these complex processes work together to form a functioning human. Eating's become about providing my body with the nutrients it needs to thrive, rather than a time when I worry about how many calories X has.
Does that make sense? Probably not. Excuse my ramblings.
I like your comment...it's true, the body is amazing and I'm enjoying learning about it so much.
I've thought the same thing! It's hard to remain caught up on your insignificant flaws when you know how incredibly complex your body is, AND how hard it is working to keep you healthy! Nothing but gratitude for it xD
I definately agree!
Em Penrose yes the same thing happened to me when I started learning about all of this. It makes me so sad now to be mean to my body, when it is constantly working so hard to keep me going. It is just so incredible. I want to make its many jobs as easy as possible... it motivates me to eat healthy and exercise.
This is so beautiful and pure. I love this take care of your bodies folks!
Quick tip: Blood Flow
Superior Vena Cava
Right atrium
Tricuspid valve
Right ventricle
Pulmonary (semilunar) valve
Pulmonary trunk
Pulmonary arteries
Lungs
Pulmonary veins
Left atrium
Bicuspid valve
Left ventricle
Aortic (semilunar) valve
Aorta
Then the rest of the body :)
you forgot about the inferior vena cava and the coronary sinus :-)
+Aron Izumino I just had to know those for anatomy. But you're right! ;)
+Emily R 😀
Emily Y Thank u so much😅
THANK YOU THANK YOU THANK YOOOOOUUUUUU .. LOL
What helped me understand the visual difference between LDL and HDL cholesterol:
LDL is low-density lipoprotein, meaning it's less packed together. Think of this like throwing a handful of pudding on a wall. It will stick and slide down the wall. Same with your blood vessels.
HDH is high-density lipoprotein, meaning it's more packed together. Think of this as a baseball. If you throw a baseball at a wall, it will bounce off the wall; same with your blood vessels, it will just continue on its way.
I always feel like crash course makes me a better person, but this one specifically makes me want to go exercise.
Watching this video actually inspired me to go for a blood pressure test after I'd felt a few symptoms for the last several weeks. It was recorded at 160/90!!! (seriously high, especially as i'm only 19). 3 days into medication + swimming and it's down to 120/80
My initial response when you said "Why are we buttering bacon?" was "Who would do that, wow, bacon doesn't need that." but then my brain went, "but what would that taste like? You should try it."
🤣 same!
it be your own blood
It really be 😂😂
Overall, another nicely produced, insightful video. However, the caption at 5:38 unfortunately contains an error. Stimulation of beta receptors (specifically beta 2 receptors) in the blood vessels by epinephrine and norepinephrine actually causes vasodilation, while it's the stimulation of alpha receptors by these same hormones that leads to vasoconstriction. Usually the alpha receptor action predominates, which is why epinephrine and norepinephrine leads to vasoconstriction and increased vascular resistance.
So while beta blockers lead to modest reductions in blood pressure on account of less forceful contractions of the heart and slower heart rate, they do not lead to dilated blood vessels (with the exception of beta blockers that also have intrinsic alpha blocking properties, such as carvedilol). It should also be noted that while beta blockers are used to treat hypertension, they are no longer first or even second-line therapy in situations that lack another compelling indication for them (e.g. heart failure, coronary artery disease - a.k.a. "heart disease").
I'm sorry if this seems like nitpicking, and I hope your fans don't pile on this comment - it really is an overall great video. I just don't want any viewers to get confused if they find it contradicts their textbook.
You need to keep this channel running long enough so I can become a supporter once I graduate. So much great free info!
6:00 was a bit unexpected in the graphics department.
Tesserex No way the people working on that kept a straight face
***** Only if they're terrible prudes...
Captain here, he means the kidney looks like a penis :flies away:
TVinmyEye it's not 9gag here you know....
WiseWik anything can be 9gag if you're brave enough
An endless amount of THANK YOUS coming from me to you Mr. Crash Course. Thank you for helping me succeed when I feel that my professors don't reach me (or we never have class because of snow)!
the second he turned science into a math equation, my brain stopped working.
Well then avoid most science because its all kinda reworking math equations. That was like half of the HW in my general chemistry class. And dont get me started on physics.
IF I PASS MY EXAM TOMORROW IT WILL BE BECAUSE OF YOU!! I BOW DOWN TO YOUR GREATNESS
did u pass it yet?
yeah i got 2.1 😂😂
lol
Maya Tammy is that good😭
These videos are really great refreshers for nursing school! Thank you so much for giving us an entertaining way to learn material!!
I can't tell you how much your videos help this old woman with her nursing studies!! Thanks so much, and love the graphics!!! Thank you.
I love this guy! I was about the go back again to re-watch the section on the blood flow equation and then he nailed it by saying "If you need to go back and review that, nobody's gonna judge you" :D
This man makes physiology
so easy!!!
ONLY EFFECTIVELY TEACHING channel I could find on yT which reaches sooo well
in such short period of time.
LOVE YOU CRASH COURSE!!!
THANK YOU
I have a heart disease apparently, and waiting for a transplant. Since I've found out a few months ago (the day I turned 25) I talk to doctors about it all the time but thanks to crash course I have a better understanding. THANK YOU
Love your videos! They really help me understand in depth about the structure and physiology of the human body! Keep up the great work!
Thank you very much Crash Course, these are great videos that educat me and remind me of topics of might have forgotten.
Hank, you're a great educator! Thanks for the videos.
Studying for my gym instructor lv2 qualification and I'm finding this easy to follow and I'm taking a lot in as well :D thank you :)
Lol I may or may not be eating potato chips while watching a video on high blood pressure woops.
That explanation for why salt matters for blood pressure was very simple and helpful.
Thank you so much for these! they are helping me so much in physiology. Its a life saver
was hoping you'd talk about the capillary exchange, either way i benefited greatly from this. thank you so much, everyone in my class calls me a genius, but it's because of you. 👍
When you rearranged the blood flow equation to basically be the MAP=CO x TPR my brain had a eureka moment and was very happy. Thank you Hank from 4 years ago.
You got me so hyped at the beginning, being someone with high blood pressure. Damn you Hank!
I wonder how many times Hank screwed up in this video. Certainly, he must be under a lot of pressure.
blackmesa232323 It's the terror of knowing
What this world is about
Watching some good friends
Screaming, "Let me out!"
Tomorrow gets me higher, higher, higher...
Pressure on people - people on streets
Andrew Mcilveen Poem about my pun, huh. *snaps vigorously*
blackmesa232323 It's some of the lyrics from the song "Under Pressure".
WAIT YOU DON'T KNOW QUEEN? WHAT? YOUR LIFE MUST BE SO MISERABLE TO HAVE NEVER HEARD THE GODLY VOICE OF FREDDIE MERCURY. I'll stop now...
Andrew Mcilveen *snaps even more vigorously*
0:19
Hank got so serious within a second.
Can you do a video on blood flow in face (with the artery, veins, capillaries etc present in human face) and how the circulation takes place.
And what happens when we blush or are in stress
"Why are we buttering bacon?" LMAO!
@ 5:57 Juxtaglomerular cells of the kidneys release renin, which can convert angiotensinogen released by the liver* (and not the kidney) into angiotensin 1 which is then converted to angiotensin 2 by ACE in capillaries. The angiotensin 2 is what raises blood pressure.
Is there any consensus on how similar any two people's circulatory systems are? I know things like cancer can grow their own blood vessels so at the smaller scales it's got to be pretty flexible, but there are lots of named blood tubes too. So at what point do things fade into a unique, person-specific arrangement?
Also, the heart will pump all the blood which the vena cava bring, adjusting the force and frequency of its contraction - this is known as the Frank-Starling mechanism (and after a certain percentage, Bainbridge reflex)
As someone with SVT and an extra electrical node in the heart, I love these videos.
Can you do a video about type one diabetes? It needs so be educated on people
Diabetes itself is a really complex disease, Type I or Type II.. I would definitely recommend 2 videos to cover all of it though!
Educate the masses :)
Excellent graphics. Excellent presentation.
you just give me the motivation to study :'D
Oh my god it's Ohm's law!!!
What's that doing here!
I can't escape it!
Loues S. Cat You're not the only one who noticed the symmetry. I too thought Ohm's law, but also F=ma.
Loues S. Cat Stick that in your transposition triangle ^_^
DC basics right in that one!
LOL
'heart hates french fries'.... I laughed out loud almost woke the whole house. FNP student here- binge watching your cardio and pulmo videos! Thanks so much!!
Is that a Homestar Runner Strong Mad figurine on the desk?! Haha, I LOVE IT!
Toasted butter bacon sandwiches are awesome. They use to sell them in various diners back in the day.
Crash Course is my jam!
Crash course is a life saver to wordy anaphysio books
I did back up and review that. Thanks for not judging
I swear I dont know what I'm gonna do when I finish this playlist. I already know.I will need more :(
Great video. So, once someone is diagnosed with severe high blood pressure, are there remedies for recovery? Or is it too late?
Be proud Mr. Hank! You saved a life!
Saviour of my physiology exam!!!❤️
This video has a lot of heart.
Thank you it really helped
I learn more in your 10 minute videos than I do in a whole term with my science teacher 😂 Thx for making people's lives so much easier
Thanks for this good work
Awesome!
Just watching all this talk about high blood pressure caused my blood pressure to go up!
For any electrical engineers who happen to be watching:
Blood flow ==> Current
Blood pressure ==> Voltage
Resistance ==> still resistance
I'm not an engineer, but I couldn't help thinking this video is half physics.
it's almost as it this is about.
..
WAIT FOR IT...
CIRCUITS!!!!
I was thinking the same exact thing!
Hank your hair looks good!
well now I'm just terrified!
As good and helpful as I'm finding these Crash course, dude, please slowwwww dowwwwn >< too much too fast >< right now to watch it again >
CrashCourse If you didn't have sustained high blood pressure but did have a larger, more muscular left ventricle, would that actually be a good thing? Like a better stroke volume and lower resting heart rate?
Is it ironic that I should be studying for my physio quiz with this video but my distraction is watching looking for Alaska?! DARN YOU GREEN BROTHERS! (But also thank you
rlly helpful thnx
Mr. Hank Green Please make a video for gait cycle and biomechanics playlist of possible!
Ia a limb is amputated for example how does the circulatory system redirect blood flow ?
Gosh how can he keep this much in minds.
Please add the closed captions in this video. Thank you
Shoutout to L6P-Bi1 getting set this for classwork during self isolation
Thanks man....😊😊😊
I have low blood pressure, it's way better than having high blood pressure. I'm at lower risk for a ton of different health problems.
Conversely though, exercise is hard for me because blood doesn't get as fast to my body parts as most other people's would, and if I get up too fast I'm at risk for fainting.
What's really scary though is that most of the diseases that cause low blood pressure are really dangerous. Right now we don't know. Might be hypothyroidism.
very nice.
3:39 yes we did yes we did😂😂😂
So blood flow is essentially Ohm's law?
RogerRoids Pretty much. A lot of electrical laws were figured out by modeling electricity as an ideal incompressible fluid.
So how do energy drinks and excess caffeine affect these things? Messing with the hormones that make the heart work harder repeatedly?
So is this why your cardiovascular endurance goes down with more muscle mass? More cells/components/mass to oxygenate?
i really love ur episodes crash course!!!! and not only me but 10,000ppls too ..
reaallly ur channel is awesome .. hope u do more videos ;-)
Thank God for hypertension medication
Cheers guys my audio & visualness applaud you!
At 4:43 when he says: "when blood pressure stretches due to high pressure" is this stretch a reduced radius (vasoconstriction)? So my question is why use the word stretch when the vessels are becoming smaller in radius? When I heard stretch I think of expansion
(increased radius). Hopefully someone can answer to this!
I don't know if it's too late but whatever. He's talking about when the blood pressure is too high, it will push against the walls of the arteries (in this case the carotid where there are baroreceptors). The force against the artery wall will cause it to stretch a little. When I say stretch I mean that the artery itself is expanding because there's just too much blood moving through it, you can also think of it as ballooning out. The stretch and force is detected by baroreceptors which send signals to the brain; if the force against the artery wall is really high (causing them to stretch) then that means the blood pressure may be too high and it will vasodilate to lower blood pressure. It can also signal the heart to decrease heart rate to decrease flow.
after years of watching crash course(the same videos over and over) i randomly decided to read the tabs in the intro. Whoever in thoughtcafe did the graphics for the intro randomly added in Evel Kneivel is from Montana. Ammm ok what does that have to do with A&P lol.
As a person with excessive anxiety this stuff always freaks me out and yet I still enjoy watching it
I am exactly the same way. Especially since sometimes I do get anxiety thinking about my heart and whether or not it is healthy.
But butter isn't bad for you. And salt is also healthy. It's all bad science.
RUclips Guru Damn that's good news then, I'm healthy as shit!
can you make about the lymphatic system please?
Just realized, that equation is basically the same as Ohm's law bit with different units for a different purpose.
It’s 1am and I’m doing my homework for technically today
interesting to think, though, that regular exercise, which increases heart rate and blood pressure, is actually good for you in the long term.
Hank is the man
" Everybodys got a hungry heart " :D
Jaqen H'ghar Bruce Springsteen?
The next episode is called Blood Part 1: True Blood. It reminded me of the television program.
i am a soon to be pharmacy student, you are a god to my biology degree and my admissions into pharmacy school >:)
I learn so much °^°
I think a distinction between Beta1 and Beta2 receptors should be included
What about high fat diets? Keto for example... how do they affect the heart?
I just noticed the Strong Mad figurine!
I feel so incredibly stoned when i watch this in .5 speed. Thanks Hank, you drug.
life is easy with crash course
When your heart gets too strong I think the walls weaken too because they are overstretched and are too thin. Kind of scary. That is why hypertension is a big deal.
Thanks for the help:)
This was not help. This video was all bad science.
RUclips Guru They have alot of bad science in there videos, alot of just out of school minds buy it because they are used to being spoon fed.
I find this video particularly annoying because I study Nutrition.
The amount of times I had to pause and rewind the video because everything flew over my head was ridiculous