题目内容

When the heart rate of normal people exceeds 180 beats/min, the main reason for the decrease of cardiac output is( )

A. Insufficient ventricular muscle oxygen supply
B. Shortened rapid ejection period
C. Slowed ejection period shortened
D. Shortened ventricular filling period

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Ventricular myocytes action potential platform phase, is mainly formed by what ions transmembrane movement()

A. Na+ inward flow, Cl -- outward flow
B. Na+ inward flow, K+ outward flow
Ca2+inward flow, K+ outward flow
D. Na+ inward flow, Cl -- inward flow

It is important to maintain the balance of water inside and outside the cell()

A. glucose
B. albuminNa+
C. K+
D. Na+

The most permeable ion of the nerve membrane at resting potential is()

A. Na+
B. K+
Ca2+
D. Cl–

The electrical activity that can conduct in an unattenuated form along an excitable cell membrane is()

A. Resting potential
B. Action potential
C. Endplate potential
D. Receptor potential

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