Question

Ventilation perfusion coupling means that more blood flows past functional alveoli than past nonfunctional alveoli. true or false

Answer 1

True. Ventilation perfusion coupling is the relationship between the amount of air reaching the air sacs of the lungs and the amount of blood reaching the lungs (mechanisms which maintain the correct proportion between alveolar airflow and pulmonary capillary blood flow). The amount of oxygen that reaches the alveoli is the ventilation. The amount of blood that gets to the alveoli is the perfusion. Alveolar ventilation brings oxygen into the lung and removes carbon dioxide. The mixed venous blood brings carbon dioxide into the lung and takes up alveolar oxygen.