The manner that oxygen enters the cell is ()
A. simple diffusion
B. facilitated diffusion
C. active transport
D. endocytosis
E. exocytosis
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The neurotransmitter at the neuromuscular junction is ()
Adrenaline
B. noradrenaline
C. GABA
D. ACh
E. 5-HT
During the absolute refractory period, the excitability of tissues is ()
A. infinity
B. greater than the normal
C. less than the normal
D. equal to the normal
E. zero
The overshoot value of AP of the neuron is close to ()
A. the sum of K+ equilibrium potential and Na+ equilibrium potential
B. the difference of K+ equilibrium potential and Na+ equilibrium potential
C. K+ equilibrium potential
D. Na+ equilibrium potential
E. the sum of RP and Na+ equilibrium potential
The depolarizing phase of AP of a neuron is formed by ()
A. deactivation of Na+ channel
B. Na+ influx
C. K+ efflux
D. Ca2+ influx
E. Cl- influx
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