The Movement of Oxygen from the Alveoli to the Blood

Multiple Choice

The movement of oxygen from the alveoli to the blood in the pulmonary capillaries depends on:

A) facilitated transport by way of the hemoglobin molecule.
B) active transport of oxygen from an area of lower concentration to an area of higher concentration.
C) diffusion of oxygen from an area of higher concentration to an area of lower concentration.
D) osmosis of the H₂O molecule across the respiratory membrane, where oxygen dissociates from hydrogen.