呼吸系统 气体交换英文版.ppt

呼吸系统 气体交换英文版;呼吸系统 气体交换英文版;精品资料; 你怎么称呼老师？ 如果老师最后没有总结一节课的重点的难点，你是否会认为老师的教学方法需要改进？ 你所经历的课堂，是讲座式还是讨论式？ 教师的教鞭 “不怕太阳晒，也不怕那风雨狂，只怕先生骂我笨，没有学问无颜见爹娘 ……” “太阳当空照，花儿对我笑，小鸟说早早早……”;呼吸系统 气体交换英文版;呼吸系统 气体交换英文版;呼吸系统 气体交换英文版;In a normal person ,the rate at which oxygen and carbon dioxide diffuse are so rapid and the blood flow through the capillaries so slow that compete equilibrium is reached well before the end of the capillaries.;In lung affections or pulmonary edema ,some of the alveoli may become filled with fluid .Diffusion may also be impaired if the alveolar walls become thickened. ;呼吸系统 气体交换英文版;Metabolic reactions occurring within cells are constantly consuming oxygen and producing carbon dioxide .Therefore , intracellular PO2 is lower and PCO2 higher than in blood .As the result ,there is a net diffusion of oxygen from blood into cells ,and a net diffusion of carbon dioxide from cells into blood. ;呼吸系统 气体交换英文版;呼吸系统 气体交换英文版;呼吸系统 气体交换英文版;The remaining 60% of the carbon dioxide molecules entering the blood in the tissues is converted to bicarbonate.