Leslie Kaminoff lecture on breathing: https://www.youtube.com/watch?v=CCo9cdZWme0&list=PLpMQmIazITmObllLYhns6VU_WNDh6artd&index=2&t=0s

my favorite ninja nerd science respiratory lectures: https://www.youtube.com/watch?v=uYm4l_alVV0&list=PLTF9h-T1TcJjdJppplKVsgPWNQ_beElaG&index=2

https://www.youtube.com/watch?v=uYm4l_alVV0&list=PLTF9h-T1TcJjdJppplKVsgPWNQ_beElaG&index=2

another great video on ventilation and perfusion:

https://www.youtube.com/watch?v=YwcNbVnHNAo

how carbon dioxide works: https://www.youtube.com/watch?v=DmuGgA2miAU&t=172s

anatomy and physiology of the respiratory system: https://www.youtube.com/watch?v=0fVoz4V75_E