Which is positive feedback in the following phenomena? ()
A. tendon reflex
B. depressor reflex
C. micturition reflex
D. pulmonary stretch reflex
E. muscular tension
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The manner that oxygen enters the cell is ()
A. simple diffusion
B. facilitated diffusion
C. active transport
D. endocytosis
E. exocytosis
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
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