Question

True or false. When discussing breathing, we can say that air enters the lungs because the diaphragm contracts and in the process, oxygen passes into the alveoli and then down its concentration gradient from an alveolus to the blood. When we breathe out, the diaphragm relaxes and carbon dioxide passes down its concentration gradient from the blood to the alveolus and then out of the lungs.

Answer 1

When we breathe in, air enters the lungs as the diaphragm contracts, allowing oxygen to pass into the alveoli and then move into the blood. When we breathe out, the diaphragm relaxes, and carbon dioxide moves from the blood to the alveoli and then out of the lungs.

Step-by-step explanation:

True. When we breathe in, the diaphragm contracts and allows the air to enter the lungs. Oxygen then passes into the alveoli and moves down its concentration gradient from the alveolus to the blood. When we exhale, the diaphragm relaxes and carbon dioxide moves down its concentration gradient from the blood to the alveolus and then out of the lungs.