A small blockage in one of the
A small blockage in one of the pulmonary capillaries results ina ventilation-perfusion inequality. The inequality leads to_________ in the affected alveoli, which results in the homeostaticresponse of __________ .
a) low PCO2; local bronchoconstriction
b) low PCO2; local vasoconstriction
c) low H+; increased alveolar ventilation
d) low PO2; local vasoconstriction
e) low PO2; local bronchoconstriction
Answer:
Ans D
Low pO2 and local vasoconstriction.
Normally the v/q ratio is 4/5 or 0.8 . This means litres ofoxygen paas through lungs each minute and 5 litre of blood passthrough lungs each minute.
Any obstruction or blockage will cause insufficient ventilationhence decreasing the partial pressure of oxygen in blood alsocausing local vasoconstriction
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