Two muscular structures control air pressure inside the lungs. Changes in air pressure cause air to move into and out of the lungs. Inhalation is the result of
A. contraction of the diaphragm and pleural membranes
B. contraction of the diaphragm and intercostal muscles
C. relaxation of the diaphragm and intercostal muscles
D. relaxation of the diaphragm and intercostal muscles
E. none of these
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Which structure prevents the backflow of blood from the ventricles to the atria?
A. AV valves
B. septum
C. sinoatrial node
D. atrioventricular node
E. superior vena cava
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