A Complete Collection of 100000 Whys
Fav十万个为什么
为什么憋气久了会头晕？
简单的摘要：憋气久了会头晕的原因主要是二氧化碳积累、缺氧以及血压变化。
1、二氧化碳积累：憋气时，人体无法排出呼出的二氧化碳，导致血液中二氧化碳水平升高，刺激化学感受器，进而影响呼吸中枢，可能引发头晕。
2、缺氧：长时间憋气会导致身体组织缺氧，尤其是大脑对缺氧非常敏感，缺氧会迅速影响大脑功能，导致头晕、头昏等症状。
3、血压变化：憋气时，胸内压升高，影响静脉血回流到心脏，心脏充盈减少，可能导致心输出量下降，血压下降，大脑供血不足，引发头晕。
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