From the external naries through each body part and cell, how does the o2 flow in?

Question

Trace the o2 from the external naires until it diffuses. i'nclude what tissues and cells are used in the trasportaion please~

Answer 1

http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookRESPSYS.html#The%20Human%20Respiratory%20System
Go to this web site ,iam sure you 'll get every single detaile about respiration and O2 diffusion
hope it will help