在皇帝企的潜水周期中,血液的pH值,血红蛋白的功能和氧气的运输
Paul J Ponganis1, Cassondra L Williams2
1Center for Marine Biotechnology & Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0204, USA.
The Journal of experimental biology
|October 24, 2025
概括
皇帝企在潜水时保持高血氧水平,即使血液pH值低至7.3.3,也可以保持高血氧水平. 在充满挑战的潜水阶段,这种血液pH对于氧气运输至关重要.
科学领域:
- 生理学 生理学 生理学
- 海洋生物学 海洋生物学
- 生物化学 生物化学
背景情况:
- 在潜水和过渡期间,最佳的血液氧气 (O2) 运输对海洋动物至关重要.
- 潜水期间的心血管调整将动物从缺氧转移到O2补充.
- 血液pH影响血红蛋白 (Hb) 的O2亲和力,影响O2的输送.
研究的目的:
- 为了研究皇帝企的血液pH,二氧化碳和乳酸之间的关系.
- 在潜水和表面间隔期间确定血液pH的适当下限.
- 评估不同血液pH对皇帝企中O2运输和储存的影响.
主要方法:
- 测量了皇帝企的血液pH,二氧化碳和乳酸水平.
- 使用不同pH值 (7.5至7.3) 的PO2形状计算出血红蛋白和值.
- 分析了与潜水时间和pH相关的血液O2储量耗尽和恢复率.
主要成果:
- 动脉氧化水平一直很高,直到上升晚期,不管pH值如何.
- 与pH值为7.3的最终潜水pH值相比,血中O2储量耗尽增加了27% (身体总体O2储量耗尽5%),而pH值为7.4.4.
- 即使在有氧潜水限制的两倍时,血液中的O2储量也没有耗尽;在更高的pH值下,表面的O2恢复速度更快,但在3分钟内完成.
结论:
- 7.3的血液pH值是皇帝企在潜水和水面间隔期间适合的下限.
- 尽管在pH值7.3时增加了O2储量耗尽,但对全身O2储量的整体影响是最小的.
- 血液pH值,高Hb亲和度和博尔效应对于皇帝企生理在临界潜水阶段至关重要,如晚上升和呼吸暂停到呼吸暂停的过渡.
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