Partial Pressures of the Respiratory Gases

[@jjcc2192]

Read the same 20 slides today over and over for more than an hour, couldn't make sense of it. 5 minute video and perfect picture. Thanks!

[@deepakratha7127]

Nice man...very simple and clear cut.

[@paulschult7161]

Great video but there is one thing I don't understand. Why exactly does the pO2 in the alveola remain constant at 100 mmHg even though oxygen diffuses into the blood. And why does the pO2 in the tissue remain constant at 40 mmHg even though oxygen diffuses there. Like why does it not increase ?

[@haydenhandley8253]

Thank you very much! I found this really useful and you explained it clearly.

[@amanim2503]

Thank you! That was really informative 🤍

[@sakibsourav2146]

Thank you. Explained clearly. I need a favour. What software did you use to create the figures and presentation?

[@abdelamajgal2812]

Thanks for your interesting video, great job From Morocco

[@kendall2004]

thank you a lot!this really helped

[@honeykhilwani7975]

Superb ! God bless you 😇

[@learningvideos2202]

Woahh thanks sooo much.... I understood it now. You explained it sooo well. Thank you!!!

[@PeteMeighan]

I'm glad it helped! Thank you-- I sincerely appreciate the positive comment.

[@nadayassmineboulahia8383]

Supper wonderful explanation I wanna ask why the pression of o2 I tracheal airs from 150 to 100 in alveolar cuz of dead spaces ??

[@PeteMeighan]

Two reasons really: 1. (you got it) The mix of the inspired air with dead space air; and 2. the continual movement of O2 from the alveolar air into the pulmonary capillary. Thank you for the kind words!

[@paymenomind1604]

This is exactly what my question was. Thank you for asking. And thank you Dr Meighan

[@user-vn8ro9iz5x]

Hi Thank you for your video! I have a question about something that is been confusing me so much and I haven’t found an answer to, when you say PaO2 in blood is that in the gaseous state or liquid state( dissolved)? If dissolved then how come it’s 100 mmHg and the solubility of oxygen is only 0.003? Also I read that the partial pressure of oxygen in plasma is equal to the dissolved and undissolved oxygen does that mean (100mmhg of oxygen + 100mmhg*0.003)? Thank you very much in advance.

[@PeteMeighan]

You're welcome! Those are good questions. Not sure if you've seen this video I put together on understanding partial pressures in respiratory physiology (gas vs liquid), but I think it might be helpful. Link: kzbin.info/www/bejne/oWStdHStZ5aiodU Let me know if you have any additional questions!

[@maheshpabbathi1037]

Sir for oxygen po2 160mmhg to 150mmhg-----decreased by humidification But pco2-o.3(atmp air) to alveoli pco2-40mmhg Sir my doubt is how co2 increased??

[@PeteMeighan]

CO2 in alveolar air is higher than the inspired air for a couple reasons: 1. The inspired air (with low CO2), mixes with the deadspace air and residual alveolar air (both air components have relatively high CO2). 2. Due to pulmonary gas exchange, CO2 is entering the alveolar air from the pulmonary blood. These factors collectively tend to produce an alveolar PCO2 of 40 mmHg at a "normal" rate of ventilation.

[@maheshpabbathi1037]

@@PeteMeighan thanks a lot sir.🙏 From india

[@ROHIT-tu6wy]

Thanks it helped I am a neet aspirant 😁 💓 from INDIA

[@PeteMeighan]

I'm happy it helped. Thank you for the positive comment!

[@ismaelsedky1246]

thank youu it was so helpful

[@PeteMeighan]

You're welcome! Glad it was helpful!

[@m.prasadprasad9080]

Thank you sir

[@FA-cy6zc]

wow thanks!!

[@AngelinSingha]

Thank you so much Really helped (╥_╥o)(╥﹏╥)o

[@error_in_the_matrix4473]

thanx

[@saumyasingh2828]

There are some wrong values