In external respiration,the PO? in the alveoli is ________________,and the PO? in the surrounding blood is ________________.
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Q69: Oxygen is released from hemoglobin to tissues
Q70: In internal respiration,the PCO2 in the blood
Q71: In external respiration,the PCO2 in the alveoli
Q182: In internal respiration, carbon dioxide diffuses from
Q183: In external respiration, carbon dioxide diffuses from
Q198: The partial pressure of a gas in
Q206: Most oxygen is transported to tissues bonded
Q213: The mineral that is essential for oxygen
Q214: The nerve impulses that stimulate contraction of
Q217: The inspiration and expiration centers are located
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