In internal respiration, the PO2 in the blood is ____________________, and the PO2 in the tissues is ____________________.
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Q187: During inhalation, intrapulmonic pressure _, and air
Q188: The air pressure outside the body is
Q189: The air pressure within the bronchial tree
Q190: A forced exhalation requires the _ muscles,
Q191: The ribs are pulled up and out
Q193: The internal intercostal muscles contribute to a
Q194: Normal exhalation is a passive process and
Q195: The elastic connective tissue of the lungs
Q196: In internal respiration, oxygen diffuses from the
Q197: In external respiration, oxygen diffuses from the
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