Which of the Following Best Describes What Happens During Inspiration

Multiple Choice

Which of the following best describes what happens during inspiration?

A) The muscles within the lungs contract, causing air to leave them.
B) The muscles within the lungs relax, permitting air to enter the lungs.
C) The muscles of inspiration contract, causing the thorax to increase in volume.
D) The muscles of the abdomen relax, allowing expansion of the diaphragm into the abdominal space.
E) Both c & d