Oxygen moves from alveoli to the bloodstream

Oxygen moves from alveoli to the bloodstream
  a. because the concentration of oxygen is greater in alveoli than in the blood.
  b. mainly due to the activity of carbonic anhydrase in the red blood cells.
  c. by using the assistance of carbaminohemoglobin.
  d. through active transport.
  e. because the concentration of carbon dioxide is greater in alveoli than in the blood.

Question 2

In order to dislodge food that has accidentally entered the trachea, which procedure is used?
  a. the Ortolani maneuver.
  b. the Herbert maneuver.
  c. the Heimlich maneuver.
  d. the Bartholin maneuver.
  e. the Feingold maneuver.