题目内容

Pacemaker cells of normal heart locate at()

A. SA node
B. AV node
C. AV bundle
D. Purkinje fibers

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Night blindness occurs in any person with ____ deficiency()

A. VitA
B. VitB
C. VitC
D. VitD

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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

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

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

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Pacemaker cells of normal heart locate at()

A. SA node B. AV node C. AV bundle D. Purkinje fibers

Night blindness occurs in any person with ____ deficiency()

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

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

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

A. SA node
B. AV node
C. AV bundle
D. Purkinje fibers