The exchange of oxygen and carbon dioxide between tissue blood capillaries and tissue cells is called: O a. external respiration O b. pulmonary respiration O c. internal respiration O d. post-pleural respiration 2. Surfactant helps to prevent the alveoli from collapsing by interfering with the cohesiveness of in the fluid film lining the alveoli, thereby reducing the surface tension of alveolar fluid O a lipid molecules O b.protein molecules Ocglucose molecules Od water molecules

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