Ask your own question, for FREE!
Biology 21 Online
OpenStudy (anonymous):

what are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.

OpenStudy (abhisar):

These are Alveoli or Alveolus (sing)

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!