Which of the following bring blood into the right atrium
A. aorta
B. pulmonary artery
C. pulmonary veins
D. vena cava
E. brachiocephalic artery
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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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