Find Tuition/Enrichment Centres

AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Answer

  • My answer is (1) “B” only because X position is where the blood with lower exygen and impurities entering the air sac and Y position is where the “fresh blood” with higher exygen level leaving the sac to other parts of the body so A and C are wrong.  For D, it is also wrong because: in human exhaled air contains about 70% nitrogen, 16% oxygen, at a few percent of water vapor and carbon dioxide and small amounts of other gases, therefore not only carbon dioxide is expelled from air sac.
0 Replies 1 Like
Find Tuition/Enrichment Centres