Cyclic Carbon Dioxide Exchange in the Turtle Pseudemys scripta
Cyclic Carbon Dioxide Exchange in the Turtle Pseudemys scripta
复制标题
龟假龟中的循环二氧化碳交换
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
F. White
中科院分区：
文献类型：
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作者：
R. Ackerman;F. White
随着呼吸暂停时间的增加，拟鼠肺容量的减少程度大于器官呼吸抑制剂（RQ）的预测。肺容量的变化主要是由于体液中CO的隔离和最低限度的非肺CO的损失。在呼吸周期的短暂呼吸阶段，储存的CO气体脉冲进入肺，并可在适当的RQ下以呼出气体的形式回收。所观察到的循环CO交换模式与CO交换的血容量下降和呼吸暂停期间的右向左心内分流有关。在实验室中，最大自主潜水时间似乎在临界P_{O_{2}}$$（肺气体）约为22 ℃时终止。这种潜水似乎是有氧的。
Pseudemys scripta lung volume decreases with increasing apneic time to an extent greater than predicted by the organismic respiratory quotients (RQ). Lung volume change is due primarily to sequestration of CO₂ in body fluids and minimally to nonpulmonary CO₂ loss. The stored CO₂ is pulsed into the lung during the brief ventilatory phase of the respiratory cycle and is recoverable in expired gas at an appropriate RQ. The observed pattern of cyclic CO₂ exchange is related to the decline in blood capacitance for CO₂ and to right-to-left intracardiac shunting during apnea. Maximum voluntary diving time in the laboratory appears to be terminated at a critical $$P_{O_{2}}$$ (lung gas) of about 22 torr. Such dives appear to be aerobic.