题目内容

Stroke volume can be decreased by()

A. Increasing ventricular contractility
B. Increasing heart rate
C. Increasing central venous pressure
Decreasing total peripheral resistance

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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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Stroke volume can be decreased by()

A. Increasing ventricular contractility B. Increasing heart rate C. Increasing central venous pressure Decreasing total peripheral resistance

Pacemaker cells of normal heart locate at()

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()

A. Increasing ventricular contractility
B. Increasing heart rate
C. Increasing central venous pressure
Decreasing total peripheral resistance