I guess I need to re-phrase my question. I want to make sure I understand how the medicine makes it to the bloodstream. Are individual molecules able to pass through the alveoli to the capillaries?
JEMS article:
http://www.jems.com/news_and_articles/columns/Rodenberg/NAVEL_Contemplation_Part_I.html
http://books.google.com/books?id=bt...Pr9oFn&sa=X&oi=book_result&ct=result&resnum=6