CHANG T.

PAFF G. H.


            The 72 hour chick embryo heart reacts to progressive hypoxia by the appearance of arrhythmias and asystole. In the presence of 4 per cent CO
            2
            , complete anoxia is tolerated for a period of 30 min. with carbon dioxide apparently augmenting the buffering capacity of the plasma clot which supports the heart. A gaseous environment of 4 per cent O
            2
            /4 per cent CO
            2
            /92 per cent N
            2
            induced a steady and entirely reversible state of cardiac stress.
          </jats:p

Effects of Different Oxygen and Carbon Dioxide Concentrations on the Activity of the Embryonic Chick Heart

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