题目内容

The primary force of lung ventilation is()

A. The pressure difference between alveolar gas and the atmosphere
B. Rhythmic contraction and relaxation of respiratory muscles
Changes in pulmonary pressure
D. Changes in intrathoracic pressure

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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

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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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The primary force of lung ventilation is()

A. The pressure difference between alveolar gas and the atmosphere B. Rhythmic contraction and relaxation of respiratory muscles Changes in pulmonary pressure D. Changes in intrathoracic pressure

Stroke volume can be decreased by()

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( )

A. The pressure difference between alveolar gas and the atmosphere
B. Rhythmic contraction and relaxation of respiratory muscles
Changes in pulmonary pressure
D. Changes in intrathoracic pressure