The main cause of edema of the lower limbs after standing too long is []
A. Dilated veins in the lower limbs
B. Increased blood flow in the lower limbs
C. Blocked lymphatic return in the lower limbs
D. Increased capillary pressure
E. Increased blood volume in the body
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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
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
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