Alveoli: Gas Exchange

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The alveoli ("many alveoli", "one alveolus") are the sites of gas exchange in the lungs. They are tiny air sacks sometimes described as being cauliflower-shaped. Oxygen diffuses across the lining of the alveoli and blood capillaries into and into red blood cells. Carbon dioxide diffuses from the blood to the alveoli. A concentration gradient is maintained by breathing as well as blood flow.
The main adaptation of the gas exchange surface are:
1. Large surface area
2. Thin wall
3. Moist lining
4. Good blood supply
5. Good ventilation

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Excellent as is the inhalation exhalation video. As a distance learning teacher, thank you!

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[@esnapeye7098]

I didn't understand the messy thing about capillaries of pulmonary artery and pulmonary vein with the air sac????

[@np4511]

Hi! what happens if there is a high CO2 concentration in the atmosphere - how will this affect heart rate?

[@Science_Sauce]

SHORT ANSWER: heart rate will increase. LONGER ANSWER: increased carbon dioxide in the air means more carbon dioxide will diffuse into the blood, raising the blood CO2 level. CO2, when dissolved in blood, makes blood more acidic. The brain recognises this drop in blood pH, and sends a signal to the heart to beat faster to try to remove it.

[@np4511]

But I'm slightly confused. If oxygen diffuses into the capillary from the alveoli how does CO2 diffuse into the capillary as well?

[@Science_Sauce]

The diffusion of one gas doesn't prevent the diffusion of another. Under normal circumstances, the blood CO2 level is higher that that in the alveoli, so CO2 would diffuse out of the blood. However, in the example you described where atmospheric CO2 level rises, the concentration in the alveoli would also increase. This would either slow the diffusion of CO2 out of the blood, or result in a change in direction of CO2 movement (if the atmospheric CO2 level became high enough).

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Thank you🙂🙂

[@ayeshanaseer3210]

name two structure across which oxygen moves from an alveolar cavity into blood capillaries?

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helps me a lot
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[@vincenttelfer4206]

at 2.25 into video, the blood capillary and the lymph capillary run in parallel separated by interstitial fluid

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Our teacher played this for us and everyone thought the alveoli looked like ballsacks

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I don't know, it just came to me.

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its called a ventilator

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Pls put some more videos such blood supply to the lungs

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[@omvirajsoodan9291]

What is important in exchange of gases?

[@comprobardisponibilidad5281]

Still I am confused of the diagram wheather the capillaries present outside the alveoli or inside . Please help me or just explain in simple terms how actually gas exchanged in capillaries

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Thank ya

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Thank you this was very helpful!

[@Science_Sauce]

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[@Lol-st7sk]

Can someone explain the term dissolve in this context?

[@hasmiati1]

Anyone can help how many times of gas movement through membrane cell from one point to another point in the gas exchange

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Thank you

[@Ghost.Spectrum]

Thanks so much man! I was always scratching my head when I saw words like "diffusion". I knew the basics of gas exchange but wanted to know more. Awesome explanation and very clear for a first semester human anatomy student! I'll try to remember this video in case my anatomy/physiology professor wants to give a more visual representation of gas exchange

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Thank you very much
Today, I did a checkpoint exam and it literally asked the question that you did in the vid
Tysm 😀

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@@Science_Sauce The test went well but since it's a checkpoint exam there should always be that hard question(s) I hope I get a 6!!!

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