【单选题】【消耗次数：1】
决定肺部气体交换方向的主要因素是
①
气体溶解度
②
气体分子量
③
气体分压差
④
温度差
⑤
气体扩散速度
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随着温度和压力的变化，气体溶解度的变化为（ ）。
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温度升高，压力降低，溶解度增大
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温度升高，压力升高，溶解度减小
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