The imbalance distribution of Na+ and K+ inside and outside the cell is due to ()
A. the high permeability of cell membrane to K+ in rest condition
B. the increase of the permeability of the cell membrane to Na+ when excited
C. the result that Na+ and K+ moving across the cell membrane by facilitated diffusion
D. the effect of Na+ pump
E. the effect of ATP
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The most important process maintaining the internal homeostasis is ()
A. nervous regulation
B. humoral regulation
C. autoregulation
D. positive feedback
E. negative feedback
The manner by which K+ moves out the cell membrane is ()
A. simple diffusion
B. facilitated diffusion
C. active transport
D. endocytosis
E. exocytosis
Compared with the simple diffusion, the primary characteristic of facilitated diffusion is ()
A. a diffusion in the same direction as the concentration difference
B. the diffusion volume increasing when the temperature rises
C. a diffusion under the help of membrane proteins
D. not consuming energy
E. a diffusion without saturation
Which ion is the key factor that involves in releasing of neurotransmitter on the neuromuscular junction ()
A. Cl-
B. K+
C. Mg2+
D. Ca2+
E. Na+
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