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题目一人体通过呼吸作用可在血液中建立如下平衡:H2O+CO2 肺H2CO3 血液H++HCO3-,从而使体内存在一定浓度的H2CO3、HCO3-,H2CO3、HCO3-的存在,能帮助人体血液pH维持在一定的范围之内(7.35～7.45之间). 1.当某些因素引起血液中酸度增加时,血液中的pH值为什么维持基本不变?用简要的文字说明. 2.已知人体在呼吸时呼出的气体中CO2的体积分数约为5％,下列说法中正确的是 (A)太快而且太深的呼吸可导致碱中毒(pH过高) (B)太快而且太深的呼吸可导致酸中毒(pH过低) (C)太浅呼吸可以导致酸中毒(pH过低)
Title 1 The human body can establish the following balance in the blood through respiration: H2O + CO2 Lung H2CO3 Blood H + + HCO3-, so that the presence of a certain concentration of H2CO3, HCO3-, H2CO3, HCO3- exists in the body, can help human blood pH Maintain within a certain range (between 7.35 and 7.45). 1. When certain factors cause an increase in acidity in the blood, why does the pH in the blood remain essentially unchanged? Use a brief textual description. 2. Known body The volume of CO2 in the exhaled breath during breathing is about 5%. The correct answer in the following statement is (A) Too fast and too deep breath can cause alkalosis (high pH) (B) Too fast and too deep Breathing can cause acidosis (low pH) (C) Breathing too light can cause acidosis (low pH)