【单选题】【消耗次数：1】
动脉血H+浓度升高主要通过外周化学感受器兴奋呼吸的原因是
①
H+难以通过血脑屏障
②
H+对中枢化学感受器有抑制作用
③
中枢化学感受器对H+不敏感
④
脑脊液对H+浓度的缓冲
⑤
以上都不对
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相关题目
【单选题】
动脉血H+浓度升高主要通过外周化学感受器兴奋呼吸的原因是
①
H+难以通过血脑屏障
②
H+对中枢化学感受器有抑制作用
③
中枢化学感受器对H+不敏感
④
脑脊液对H+浓度的缓冲
⑤
以上都不对
【单选题】
通过兴奋中枢化学感受器增强肺通气的有效刺激是：
①
脑脊液H+浓度升高
②
脑脊液CO2分压升高
③
脑脊液O2分压降低
④
动脉血H+浓度升高
⑤
动脉血O2分压降低
【单选题】
中枢化学感受器最敏感的刺激物是（）
①
血液中的CO<sub>2</sub>；
②
脑脊液中的CO<sub>2</sub>；
③
血液中的H<sup>+</sup>；
④
脑脊液中的H<sup>+</sup>；
⑤
血液中的O<sub>2</sub>
【单选题】
H+对呼吸的刺激主要是通过
①
直接刺激中枢的呼吸神经元
②
刺激中枢的化学感受器
③
刺激颈动脉窦和主动脉弓感受器
④
刺激颈动脉体和主动脉体感受器
⑤
抑制颈动脉体和主动脉体感受器
随机题目
【单选题】
Education and medical care are very ____ in theUnited States.
①
much
②
cheap
③
many
④
expensive
【单选题】
Since the road is wet this morning, ____ last night. ?
①
it must have rained ?
②
?it must rain ?
③
it must be raining ?
④
it must have been rained?
【单选题】
The factory is said ____ in a fire two years ago.
①
to have destroyed
②
to be destroyed
③
to destroy
④
to have been destroyed
【单选题】
The prices of the agricultural products have been ____ steadily in the past few years.
①
risen
②
raised
③
arisen
④
aroused
【单选题】
The organization has developed several techniques useful to other groups ____ the similar work.
①
to do
②
do
③
does
④
doing
【单选题】
____ it is you found, you must give it back to the person it belongs to.
①
That
②
Because
③
Whatever
④
However
【单选题】
If you don’t think it necessary to make ____ any missed lessons, speak up now.
①
up for
②
up with
③
up to
④
away for
【单选题】
No sooner had he sat down to lunch ____ there was a knock at the door.
①
when
②
that
③
as
④
than
【单选题】
When the teacher had ____through with the class, they felt very ashamed.
①
gone
②
got
③
done
④
taken
【单选题】
“Which of these two ties will you take?” “I’ll take ____to give me a change sometimes.”?
①
either ?
②
both ?
③
neither ?
④
all?