The characteristics of myocardial excitability changes are that []
Absolute refractory period is short
B. Effective refractory period is particularly long
C. Relatively refractory period is short
D. supernormal period is extremely long
E. subnormal period is Long
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The highest autorhythmicity part is []
A. Sinus node
B. Atrial muscle
C. Atrioventricular junction
D. Peripheral Purkinje fibers
E. Atrioventricular bundle
The action potential plateau of ventricular myocytes is the comprehensive result of which ions flow across the membrane []
A. Sodium ion influx, chloride ion outflow
B. Sodium ion influx, potassium ion outflow
C. Sodium ion influx, chloride ion inflow
D. Calcium ion influx, potassium ion outflow
E. Potassium ion outflow, calcium ion outflow
What can reflect the process of left and right atrium depolarization is []
A. P wave
B. QRS complex
C. T wave
D. P-R interval
E. ST segment
The fastest conducting site in the heart is []
A. Sinus node
B. Atrial muscle
C. Atrioventricular junction
D. Purkinje fiber
E. Ventricular muscle
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