A small blockage in one of the pulmonary capillaries results in a ventilation-perfusion inequality. The inequality...

A small blockage in one of the pulmonary capillaries results in a ventilation-perfusion inequality. The inequality leads to _________ in the affected alveoli, which results in the homeostatic response 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

Expert Solution

Ans D

Low pO2 and local vasoconstriction.

Normally the v/q ratio is 4/5 or 0.8 . This means litres of oxygen paas through lungs each minute and 5 litre of blood pass through lungs each minute.

Any obstruction or blockage will cause insufficient ventilation hence decreasing the partial pressure of oxygen in blood also causing local vasoconstriction

gladiator answered 2 years ago

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