人体吸气时呼吸肌收缩,胸廓向上向外移动,如尽力吸气膈肌还会收

人体吸气时呼吸肌收缩,胸廓向上向外移动,如尽力吸气膈肌还会收缩,使膈顶下降,结果( )
A
、肺内气压减小,外界气体入肺          B、肺内气压增大,外界气体入肺
C
、肺内气压减小,外界气体出肺          D、肺内气压增大,外界气体出肺

答案

A

相关题目

简述聂赫留朵夫到监狱探望玛丝洛娃的经过。  
简述聂赫留朵夫到监狱探望玛丝洛娃的经过。  
下列实验不能成功的是( ) A.用肥皂水检验软水和硬水 B.用
下列实验不能成功的是( ) A.用肥皂水检验软水和硬水 B.用食醋区分食盐和小苏打 C.将冷碟子放在蜡烛火焰的上方,得到炭黑 D.加熟石灰粉末研磨
— Where _____? — I got stuck in the heavy traffic. I _____ here earlier. A.
— Where _____? — I got stuck in the heavy traffic. I _____ here earlier. A. did you go; had arrived         B. have you been; would have been C. were you; would come      
With so many children ____round the table, the food disappeared_______. A.se
With so many children ____round the table, the food disappeared_______. A.seating, at no time         B.seated, in no time C.seated, at no time          D.seating, in no t
 It was a pity that the great writer died      his works unfinished. A. fo
 It was a pity that the great writer died      his works unfinished. A. for             B. with             C. from         D. of
为了调查喜爱运动是否和性别有关,我们随机抽取了50名对象
为了调查喜爱运动是否和性别有关,我们随机抽取了50名对象进行了问卷调查得到了如下的列联表:若在全部50人中随机抽取2人,抽到喜爱运动和不喜爱运
“螳螂捕蝉,黄雀在后”,下列可以体现这一现象的正确食
“螳螂捕蝉,黄雀在后”,下列可以体现这一现象的正确食物链是     A.螳螂→蝉→黄雀    B.树→螳螂→蝉→黄雀     C.蝉→螳螂→黄雀   
人体内备用的能源物质是(   )A、蛋白质        B、无
人体内备用的能源物质是(   )A、蛋白质        B、无机盐        C、脂肪    D、糖类 

最新题目