Red blood cells | Human anatomy and physiology | Health & Medicine | Khan Academy
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- čas přidán 8. 07. 2024
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Oxygen uptake by hemoglobin in red blood cells. Created by Sal Khan.
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He's voice just draws me in even more, especially when he gets excited about something. Lol. I need a life.
A lesson in blood pressure would be greatly appreciated . Thumps up if you agree , so SAL can see this ...
I LOVE YOU!!!!!!!!!!!! Im a nursing student and trying to figure everything out.....TY TY TY
Here to remind you this comment exists you’re probably a wonderful nurse now!
What would we do without you! Thank you so much for all your terrific videos :) :) :)
Please keep making the 20 minute videos..you're very helpful
Thank you soo much!! Makes more sense with your explanation and drawing
Thanks educational.
now i know were to get research if i ever need it,thx
Sal, that was a kickass explanation. Thank you!
i concur! helpful indeed!
Helpful!
Did I ever tell you that I LOVE YOU Sal? Because you really make my life so much easier! =)))
reallly apppreciate the hard work..keeep it up khans aca...👈👏👏👏👏👏👏👏👏👏
I'd take a bullet for you Sal...Your my hero!!! No sarcasm, no joke...You are my hero
helpful, thanks
You should do a video on the chloride shift... That would be extremely helpful! :)
Here to remind u this comment exists
Thank you so much
awesome!!!
But khan, I've read somewhere deoxygenated blood is actually a darker shade of red compared with oxygenated blood?
great!
love this guy
Fantastic videos. I really wish I had found you this summer while I was taking Anatomy 1 & 2 and Micro all at the same time! Still glad I know about these now that I'm in nursing school... Super helpful with Pathophysiology!
Here to remind you this comment exists you’re probably a wonderful nurse now!
it's really awsome!!!!!!!!!!!!!!
this was great :)
This is confusing but helpful
Sir you are extraordinary 🙏🙏🙏🙏🙏🙏
10 years and still this video is gold🙂
I read that nitrogen doesn't get into the blood because at normal pressure it doesn't dissolve into water. That's a reason why we can't stay to long under high pressure, because are blood gets intoxicated with nitrogen.
Thanks !! XD
Fantastic sir
you are so awesome.
Kind sir, thank you so much for your videos. I was about to smash by laptop and burn my textbooks and check myself into the crazy house and then i found your videos! You make science fun too learn and easy to understand. Your like a modern Bill Nye.
to think that im just starting to study this and u just uploaded this recently WTF
this world is so cold, im so lucky
Great
pretty sure i have learned that the vein is actually blue and the blood does not give it that color. deoxygenated blood is dark maroon and the material of the vein is blue.
Watching this for my human anatomy test tomorrow RIP me
your amazing! why did I now find you😭😭😭😭
I WANNA WACH ALL YOUR VIDIOS HEHEHE
When diffusion occurs between alveoli and capillaries, if there is air on both the sides, then how do the different types of air know that there is a deficiency of that particular kind of air on the other side?
what is the flap the block the food from entering the larynx and stay in the esophagus?
How long does it take for a blood cell at the heart to go to the lungs, back to the heart, to the brain, and back to the heart?
Hemoglobin contains 4 Hem-groups, you mentioned only ion ,I didn't hear the remaining three groups .What are they?
doesn't really answer what happened to nitrogen. Does it diffuse into the capillaries and enter the circulation or there is a mechanism to filter nitrogen gas out before blood returned to the heart?
He said some of it diffuses through the capillaries, but I believe it basically just reaches a diffusion equilibrium because it doesn't have anything to enhance it's concentration in the blood like hemoglobin does for oxygen... So you don't have an elevated concentration like oxygen, it isn't used for cellular respiration like oxygen, and it isn't produced by cellular respiration like carbon dioxide that just increases its concentration by a diffusion gradient. So some nitrogen goes into your blood, takes a ride around your circulatory system, and leaves at the lungs again.
I believe that's why they don't use regular nitrogen-rich air for deep sea diving because the pressure increases the diffusion gradient for nitrogen and you get extra nitrogen forced into your blood that doesn't do anything EXCEPT give you a higher risk of the bends (nitrogen bubbling out of your blood when the pressure lets up), so they use another "carrier" gas that doesn't diffuse in your blood as easily as nitrogen...
The epiglottis
How does blood stay liquid? How or why does the body keep liquid. Does blood Harden in the bloodstream if the dehydrated?
May I ask happens if the concentration of CO2 in the air is going to increase till 2% caused by global warming?
How this is going to affect exchanges of CO2 in the alveoli system?
so how does the process of Apoptosis take place with the cell. they die daily and every 7 years we have a renewed cell structure
Wouldn't the haemoglobin proteins be nearly the size of an atom if a RBC contains millions of them?
So it's plasma that gets to carry carbon dioxide to the heart and not rbcs?....what about allosteric inhibition? Where you mentioned co2 binding to hemoglobin
+olaitan CO2 first has to be converted to H2CO3 (carbonic acid) via carbonic anhydrase inside the RBCs, then the product HCO3- (bicarbonate) can exit the RBCs and stay in solution in the plasma. There is a low amount of CO2 that dissolved in the plasma, but this is negligible because a gas would bubble out of solution if it remains in the gaseous state. CO2 does compete with O2 for HgB, but it is H+ from carbonic acid that does the majority of competing for HgB and this normally occurs near actively respiring cells such as muscle cells where high level of CO2 is produced. This competition for HgB then decrease affinity of HgB for O2 and allows O2 to be taken up by those respiring cells. Hope that helps.
Sir, if veins carried oxigenated blood then why it's colour is dark.? In contrast to this arteries should have dark colour due to deoxygenated blood
"Carbon dioxide actually gets diffused in the blood, it is actually carried in the plasma in the blood; it's not carried by the red blood cells."
To clarify: ~5% CO2 *dissolves* into the plasma under the partial pressure of venous CO2 at 46 mmHg. Another 5-10% is transported on the globin chain of hemoglobin as "carbaminohemoglobins". CO2 and water form carbonic acid in the RBC; the conjugate base (bicarbonate) leaves the RBC into the plasma via the chloride shift forming the other 85-90%.
Hi there. I am a teacher. What program do you use to film these videos? Thank you Connie
smooth draw 4.0
at 10:16
To be honest the video's head title was about red blood cells and you only talked 4 minuts about it out of the 16 minuts :)
@reddogpremier He meant like the shape of cough drops. That's what they're called! Lozenages or something like that haha. Just look up what Ricola is shaped like, or Halls Cough Drops.
Christy Carpenter bhagot कथा
Red blood cells
sir i want to ask does all of the nitrogen goes back in to the atmosphere because our veins have nitrous oxide
What is a "lausage" that you said the red blood cell was shaped like?
Lozenge.
So sal has salveoli ?
what about white blood cells?
but i have been told that hemoglobin is found on RBC membrane.... you said they are found inside the cell....can you clarify please
holes manholes the rbc is made up of four haemoglobin molecules to which the oxygen binds to.
You are indeed wrong about sight. When light comes down every wavelength of light but that of what you see is absorbed. The light, this time from red blood cells, is red so thats is what is reflected and seen by you.
i knew that (no i didnt so thx dude)
i remembered this children's story where the library woman had lozenges that tasted like war when you said "lozenges" but i just cant remember anything else about the story or what it was called.... its bugging me now :S
why is oxygen uptake for hemoglobin ~98% and not 100%?
gtob23 i think 1.5% of the oxygen is absorbed in blood/plasma throughout diffusion, i think?
My teacher told this . he said in haemoglobin basically comp some structures or centres are present which do not bind with oxygen that's why its not 100%
around 12:53 he is saying that because the light of the wavelength of red light is being reflected by oxygenated hemoglobin we perceivably see the RBCs reddish
This contradicts with what I believe to know:
If we see the color red, it's not because red is being reflected, but absorbed and all the other wavelengths of the spectrum of the visible light are being reflected; our brain receives the signal that 'red' is missing and interprets us the color as being red; please correct me if Im wrong
RefractoWhat Yup, you are wrong. It is the opposite that is true. (Please correct me if I am wrong)
the explaining needs work and needs to be straight forward
a large misconception is that blood turns from blue -> red. it actually goes from light red to a slightly darker red. veins are blue to the eyes because of the light coming through the skin, take away your skin and you'll see your veins are red. you are not alien, your blood is always red lol
Erythrocytes, yay!
What didi I do before these videos? oh yeah, I failed.
u are so smart lol
bane
Good video but you lost me at favorable evolutionary trait.IMO there's no way that all that happened by chance.
Science is true whether you believe it or not, that is the amazing thing about it. And even the christian theory of how life began includes a form of evolution. You should watch the debate between Bill Nye and a Christian scientist(I forget his name). Very informative if you keep an open mind
I'll check it out.I do believe in adaptation never heard about tg Christian theory of evolution.
If god is real, then how was he created? He was either created by something else or by chance. If you keep asking that question, at some point something had to have been created by chance. Since we are the simplest form of this theoretical hierarchy, it would make sense that we would be the ones created by chance. Evolution and modern genetics provide evidence of this, and these are things that you can test and get unbiased results. You don't need a god to give your life purpose or wonder. The fact that everything is random can be a beautiful thought if you look at it from the correct angle.
ILSappr You're right ILSappr, there's no way such a system could have been an accident. God is the force behind evolution. Many Christians incl Catholics accept this. God was the force behind the big bang. Something cannot come from nothing - we know that logically. As for how God came to be, God is the being who transcends time and space - he "always was and always will be". That's what "Yahweh" means: "I am, who am" - he transcends time and space. There is nothing else to explain how something (the big bang and the universe) could come from nothing, other than from a force that exists outside the realms of space and time: God.But God is even more than this. He is a loving God who loves and knows every single person he created personally and to the most miniscule detail, including the ones who don't know or believe in him.Hope this clears some of your questions up :)
Madeleine Enright Religious people are hilarious, when science came up with the big bang and evolution most religious folk denied the evidence, saying it's not possible as according to a book. Now as mounting evidence is thrust into the nay-sayers faces, they conveniently say god was behind it the whole time. Religion is the realm of ignorance and as science progresses that realm will shrink. Also something can come from nothing, as shown by Stanley Miller and Harold Urey in their experiment where they showed that in earths early life, the environment could have produced the building blocks of life. BOOM.
noooooooo nucleus. noooooooooooo dna.