细胞外液的K+浓度明显降低时,将引起神经细胞()
A. 膜电位负值减小
B. 膜的K+电导增大
C. 钠泵活动增强
D. K+平衡电位负值减小
E. Na+内流的驱动力增大
神经细胞膜上Na+的跨膜转运方式是()
A. 单纯扩散
B. 易化扩散
C. 主动转运
D. 易化扩散和主动转运
E. 单纯扩散和主动转运
Which of the following best describes a physiological difference between the contraction of smooth muscle compared with the contraction of cardiac muscle and skeletal muscle?( )
A. Ca++ independent
B. Does not require an action potential
C. Requires more energy
D. Shorter in duration
E. None of the above
在直流电路中,电感相当于______ ,电容相当于______ 。 ______
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