Science Questions and Answers

Start Your Free Trial

what is the role of diffusion in gas exchange?

Expert Answers info

trophyhunter1 eNotes educator| Certified Educator

calendarEducator since 2010

write1,786 answers

starTop subjects are Science, Social Sciences, and Literature

Diffusion is the spread of molecules from regions of high to regions of low concentration. Molecules that are concentrated will randomly move about(diffuse) and eventually, after colliding, they get distributed uniformly, reaching an equilibrium. In terms of gas exchange, the respiratory gases oxygen and carbon dioxide are exchanged at the thin, moist respiratory surface called alveoli, air sacs located in the lungs. These are surrounded by blood capillaries, thin-walled vessels which allow...

(The entire section contains 231 words.)

Unlock This Answer Now

check Approved by eNotes Editorial