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【单选题】
心肌不会产生强直收缩的原因是:
⑤
心肌的有效不应期特别长,相当于收缩期和舒张早期
【单选题】
强心苷提高心肌收缩力的作用机制是( )
①
激活心肌细胞上的Na\super+\nosupersub ,K\super+\nosupersub -ATP酶,提高细胞内钙离子浓度
③
抑制心肌细胞膜上的Na\super+\nosupersub ,K\super+\nosupersub -ATP酶,提高细胞内钙离子浓度
【单选题】
心交感神经节后纤维末梢释放的递质和心肌细胞膜上相应的受体是:
【单选题】
心肌桥的诊断是()
③
心肌桥患者在心室舒张期、收缩期均出现冠状动脉血供减少
【单选题】
His final success ( ) his years of hard work.
【单选题】
This machine is extremely ( ) because it runs on half-price electricity.
【单选题】
More local ( )will be created, particularly in service industries.
【单选题】
Doctors should ( )prevention of diseases rather than cure.
【单选题】
The ( )to her success is her confidence and persistence.
【单选题】
He found it hard to ( ) his studies in such a noisy environment.
【单选题】
The research findings indicate that human ( ) develops rapidly in childhood.
【单选题】
What shall I ( ) to qualify for the job?
【单选题】
She had made many ( ) into the quality of the computer before buying one.
【单选题】
Tony is such a nice guy. He will not ( ) a moment to offer help when you are in trouble.