#respiratory

This is an older study, but it's conclusions are still true. Wearing a mask and having optimal air quality reduces the risk of getting sick. C02 levels should be below 800ppm.

It's october 1st !!

I will be starting my refresher course for board review next week and I told myself once october starts, I'll stop dilly-dallying and lock in with studying.

But... its 330pm now and I've only watched B99 and checked in with my review center's sites to prep for next week.

Will update later about today's progress, maybe as day 1 of 100 of 100 days of productivity.

I honestly wanted to do it annually since... was it 2021 when I did the first one ?? But life just got in the way—nearly 2h commutes to uni, another 2 going home, then during internship it's either a very long commute to and from again (first hospital was in another city) and while the other one was only 30 minutes away from home, everyday shifts were so tiring that if I weren't on duty, I was asleep 😅 but that was the most fulfilling rotation though.

This time, for about a month will be online, then on november or december will be on hybrid set up. So either way, I have more time on my hands and this challenge will force me to really do something at least 2 subjects a day.

Co2 (carbon dioxide) - 3 ways

1) dissolved in plasma (10%)

2) as hco3 (bicarbonate) (70%)

a) happens both inside the red blood cell and in plasma.

i) co2 binds with h2o (water) to make h2co3 (carbonic acid) which is unstable so it breaks itself into H (hydrogen) and hco3 (bicarbonate)

ii) slower process in plasma compared to in rbc because rbc has carbonic anhydrase enzyme to speed it up

iii) the hco3 inside the rbc needs to shift outside into the plasma, it shifts through a transport channel with the help of the protein Band 3. In exchange, Cl (chloride) shifts inside. This is to keep electrochemical neutrality.

iv) excess H binds with Hb (hemoglobin) making HHb (deoxyhemoglobin). Too little H -> high pH = alkalosis. Too much H -> low pH = acidosis

3) as HbCo2 carbaminohemoglobin (20%)

a) co2 binds with Hb. It binds to the globin part

O2 - 2 ways

1) dissolved in plasma (2%)

2) bound to hemoglobin HbO2 (98%)

Why is it that in movies, when someone is wearing an oxygen mask, they either don’t speak, are discouraged to do so or have it taken off if they want to say something?

On a tangential note, when it comes to that other kind of masks used in non invasive ventilation, like bipap, can one speak with it on?

You can absolutely speak in an oxygen mask. Unfortunately, even in person people can have a hard time understanding what is being said through an oxygen mask. It's also hard to see the person's lips moving, so I assume it would be difficult to mic/film well.

Without knowing a lot about the sound technology of movie making, I assume this is just a choice so they don't have to dub over what is being said. It can also just add a little flair to the scene- he wants to talk so bad he's giving up his life-saving oxygen!