Describe the relationships among the bronchioles, alveoli, and blood vessels.
a) Bronchioles deliver air to the alveoli, where gas exchange occurs with blood vessels.
b) Blood vessels deliver air to the alveoli, which transfer it to the bronchioles.
c) Alveoli filter air for the bronchioles, which then transport it to blood vessels.
d) Blood vessels transport oxygen from the alveoli to the bronchioles.
