Mammalian Cell Biology, Human Anatomy and Physiology · Respiratory System · 2 marks · Numerical answer
Breathing rate is 18/min, tidal volume 500 mL and anatomical dead space 150 mL. Heart rate is 120/min and stroke volume 50 mL. Find alveolar ventilation/perfusion ratio to two decimals.
Alveolar ventilation excludes dead space: VA=18×(500−150)=6300 mL/min. Perfusion is cardiac output Q=120×50=6000 mL/min. Their ratio is VA/Q=6300/6000=1.05. Using total ventilation would count gas that never reaches the exchanging alveoli.
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