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下图为人体血液循环示意图，图中①②③④表示心脏各腔．请据图回答问题： （1）在①和②、③和④之间，存在着防止血液倒流的______． （2）与②______相连的血管名称是______． （3）人体内二氧化碳浓度和含氮浓度始终保持最低的血管分别是______和______（填字母代号），在肾脏两侧，______侧血液含氧量较高（填代号）． （4）B为______，其内流动着______血． （5）某人患急性肾炎，静脉注射青霉素后，在心脏中最先发现药物的是图中标号______，其内血液是______血． （6）在小肠内才开始消化的营养物质是______，其消化后的产物主要经______吸收进入血液循环．
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举一反三
【单选题】党 员 如 果 没 有 正 当 理 由 连 续 个 月 不 缴 纳 党 费 就 被 认 为 是 自 行 脱 党 。
A.
5个月
B.
6个月
C.
7个月
D.
8个月
【单选题】Cellular respiration is to ( ) as ( ) is to chloroplasts.
A.
nucleus, cytoplasm
B.
mitochondria, photosynthesis
C.
ATP, light
D.
nucleus, protein synthesis
【单选题】中国共产党廉洁自律准则》规定党员领导干部要廉洁从政，（）。
A.
自觉保持人民公仆本色
B.
自觉维护人民根本利益
C.
自觉提升思想道德境界
D.
自觉带头树立良好家风
【多选题】What are the roles of ubiquinone in cellular respiration?
A.
In the mitochondrial respiratory chain, the small, hydrophobic molecule ubiquinone picks up electrons from the NADH dehydrogenase complex and delivers them to the cytochrome c reductase complex.
B.
A ubiquinone molecule can accept or donate either one or two electrons, and it picks up one H + from water with each electron that it carries.
C.
Its redox potential of +30 mV places ubiquinone between the NADH dehydrogenase complex and the cytochrome c reductase complex in terms of its tendency to gain or lose electrons—which explains why ubiquinone receives electrons from the former and donates them to the latter.
D.
Ubiquinone also serves as the entry point for electrons donated by the FADH 2 that is generated both during the citric acid cycle and from fatty acid oxidation.
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