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BIO377 Chapter 13 Exam Questions and Answers 100% Pass The most important determinant of airway resistance is the ______ of the _______. - Answers radius/airways The ____________ (internal or external?) intercostal muscles are activated during inspiration. - Answers external ___ milliliters of oxygen are normally dissolved in 1 liter of systemic arterial blood ___ is the typical cardiac output in liters per minute ___ milliliters of oxygen normally bound to hemoglobin in 1 liter of sy...