A) increased alveolar volume causes increased alveolar pressure.
B) increased alveolar volume causes decreased alveolar pressure.
C) decreased alveolar volume causes increased alveolar pressure.
D) decreased alveolar volume causes decreased alveolar pressure.
E) increased alveolar pressure caused decreased alveolar volume.

A) the diaphragm relaxes.
B) the diaphragm contracts.
C) the lungs expand.
D) the lungs contract.
E) none of the choices are correct.