(1) Individual gases, such as oxygen, will move from an area of ___ partial pressure to an area of
___ partial pressure.

(2) The bottom of the trachea branches into two ____

(3) _____ sweep away the mucus that the lungs secrete.

(4) The presence of carbonic acid causes the hemoglobin to ___.

Answers;
(A) Cilia (B) Low (c) High (d) Release oxygen (E) Primary bronchi