What amount of Oxygen is needed to breathe for 15 minutes? What did you base your value on?

breathing -------------- approx air ----- N2 ------------- O2 -------------- CO2


inhaled ----------------- 100 ------------- 78 ------------- 21 ------------- 0.04


exhaled ---------------- 100 ------------- 78 ------------ 15 ------------ 4.00





tidal vol of air inhaled = 0.50 L per breath


breathing rate at rest = 12 breaths/min


tidal vol of air inhaled = (12)(0.50) ====%26gt; 6 L/min


tidal vol of O2 inhaled = (6)(0.21) ====%26gt; 1.26 L/mi


tidal vol of O2 exhaled = (6)(0.15) ====%26gt; 0.90 L/min


vol of O2 consumed = 1.26 - 0.90 ====%26gt; 0.36 L/min





vol of O2 consumed in 15min = (0.36)(15) = 5.4 L