Which of the following about action potential is wrong? A: all or none B: unattenuated potential C: has refractory period D: stimulus dependence

Alpha methyldopa is primarily used for: A: Pregnancy induced hypertension B: Renovascular hypertension C: First line agent in hypertension D: Refractory hypertension

下列哪项不影响心肌细胞的auto-rhythmicity A: maximal repolarization potential B: threshold potential C: effective refractory period D: 4期自动去极速度

The main cause of the refractory stage (or microcirculatory failure stage) of shock is A: Acid-base disturbances B: Lung edema C: Cardiac dysfunction D: Serious renal dysfunction E: Failure of vasoconstriction response or DIC