Which of the following normally serves as the pacemaker of the heart? ()
A. SA node
B. the atria
C. A-V node
D. the Purkinje fiber
E. the ventricle
查看答案
The characteristic of ventricular muscle cells includes ()
A. conductivity and contractility
B. excitability, autorhythmicity, conductivity and contractility
C. autorhythmicity, conductivity and contractility
D. excitability, conductivity and contractility
E. excitability, autorhythmicity and contractility
The relative stabilization of physical and chemical properties of internal environment is called ()
A. excitability
B. reflex
C. hemostasis
D. homeostasis
E. hematocrit
The regular response of organism to the stimulation under the mediation of central nervous system is called ()
A. excitability
B. reflex
C. action
D. contract
E. production
The characteristics of autoregulation are ()
A. rapid, accurate and short
B. rapid, accurate and long
C. slow, diffuse and short
D. slow, diffuse and long
E. amplitude and range are smaller
微信支付 
支付宝支付