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拔河是一种用力较大的游戏。当幼儿用力拉扯时,往往要憋住气。憋气会引起身体一系列的变化:憋气前要深吸气,然后声门紧闭,这时肺组织充满空气,内压升高,压迫了肺毛细血管,下腔静脉也受到挤压,于是静脉血液向心脏回流因之减少,心脏输出的血量也显著下降,从而影响对全身器官血液的供应,妨碍身体各机能的正常活动。当停
Tug of War is a hard game. When children pull hard, often choke on gas. Suffocation will cause a series of changes in the body: deep breaths before suffocation, then glottis closed, then the lung tissue is full of air, the internal pressure, oppression of the pulmonary capillaries, the inferior vena cava is also squeezed, so the vein As a result, the amount of blood output from the heart is also significantly reduced, thereby affecting the blood supply to the whole body organs and hindering the normal activities of various functions of the body. When stopped