Physiology MCQs

Page No. 33

What effect does hyperventilation have on the oxygen binding affinity of hemoglobin ?


aP50 and oxygen affinity decrease


bP 50 and oxygen affinity increase


cP 50 decreases and the oxygen affinity increases


dP50 increase and the oxygen affinity decreases



During the initial part of inspiration, which of the following does not occur ?


aIntrapulmonary pressure falls


bIntra thoracic pressure rises


cIntra-abdominal pressure rises


dThe partial pressure of O2 in dead space rises



Cyanosis or bluish coloration of skin and mucus membrane depends upon______________?


aThe relative proportion of reduced and oxygenated hemoglobin


bThe absolute amount of reduced hemoglobin


cThickness of the skin


dFragility of capillaries



Limitation of inspiration by vagal lung inflation signals is called the______________?


aAutonomic reflex


bBainbridge reflex


cHerring – Breur reflex


dDynamic stretch reflex



Non- respiratory function of the lung is_________________?


aDopamine metabolism


bAdrenaline metabolism


cSerotonin metabolism


dPGE2 production


View Answer Serotonin metabolism

Oxygen affinity is increased by all except_________________?


aAlkalosis


bHypoxia


cIncreased HbF


dHypothermia


View Answer Hypoxia

Arterial O2 content is reduced in one of following ______________?


aStagnant hypoxia


bAnemic hypoxia


cHistotoxic hypoxia


dHypoxic or arterial hypoxia


View Answer Anemic hypoxia

Oxygen affinity decreases in_________________?


aHypoxia


bHypothermia


cHbF


dIncreased pH


View Answer Hypoxia

Vital capacity is a measure of________________?


aTidal volume


bInspiratory reserve volume plus expiratory volume


cTidal volume plus inspiratory reserve volume plus expiratory reserve volume


dExpiratory reserve volume plus reserve volume



Ventilation perfusion ratio is maximum in_______________?


aBase of lung


bApex of lung


cPosterior lobe of lung


dMiddle lobe of lung


View Answer Apex of lung

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