Question

When air moves into the lungs, oxygen

O is converted into carbon monoxide
O diffuses across the membranes of the alveoli and enters the blood
O diffuses across the membranes of the alveoli and exits the blood
O moves across the membranes of the alveoli by active transport

Answer 1

When air moves into the lungs, oxygen diffuses across the membranes of the alveoli and enters the blood.