Which volume remains in the lungs after a maximal expiration? ()
A. Tidal volume (VT)
B. Vital capacity (VC)
C. Expiratory reserve volume (ERV)
D. Residual volume (RV)
E. Functional residual capacity (FRC)
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A 49-year-old man has a pulmonary embolism that completely blocks blood flow to his left lung. As a result, which of the following will occur? ()
A. Ventilation/perfusion(V/Q) ratio in the left lung will be zero
B. Systemic arterial PO2 will be elevated
C. V/Q ratio in the left lung will be lower than in the right lung
D. Alveolar PO2 in the left lung will be approximately equal to the PO2 in inspired air
E. Alveolar PO2 in the right lung will be approximately equal to the PO2 in venous blood
The oxygen dissociation curve shifts from the normal position to the left, which of the following can be seen ()
A. Increased tissue metabolism
B. Anemia
C. The amount of oxygen entering the tissue from the blood increases
D. Store blood for weeks
E. It indicates that the oxygen content of blood decreases at a certain oxygen partial pressure
In normal condition, the effective stimulation which may keep the respiratory center in-excitement is ()
A. afferent impulse from pulmonary stretch receptor
B. afferent impulse from proprioceptors in respiratory muscle
C. hypoxia in certain level
D. CO2 in certain concentration
E. CO2 in high concentration
The most important physiological factor of regulating respiratory movement is ()
A. CO2
B. O2
C. H+
D. 2,3-DPG
E. CO
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