What roles do the diaphragm and the cilia play in the human gas exchange system?
- Adiaphragm contracts to cause breathing in; cilia carry mucus to the throat
- Bdiaphragm contracts to cause breathing out; cilia trap bacteria from the air
- Cdiaphragm relaxes to cause breathing in; cilia filter dust from the air
- Ddiaphragm relaxes to cause breathing out; cilia produce mucus