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![]() The Euler-Liljestrand mechanism regulates the perfusion of nonventilated alveoli: if a lung section is perfused but not ventilated, there will be a drop in the oxygen concentration in the blood, resulting in hypoxic vasoconstriction. The ventilation-perfusion ratio is higher in the apex of the lung than at its base. ![]() ![]() Perfusion of the pulmonary capillaries is closely regulated to match ventilation in order to maximize gas exchange. The physiologic dead space is the volume of inspired air that does not participate in gas exchange. Ventilation is the movement of air through the respiratory tract into (inspiration) and out of (expiration) the respiratory zone ( lungs). ![]() ![]() Top Rated TV Programs: 2012 - 2013 Program Rating NCIS 21.6 Sunday Night Football 21.0 The Big Bang Theory 19.0 NCIS: Los Angeles 17.5 Person of Interest 16.2 American Idol (Wednesday) 15.1 Dancing With the Stars (Monday) 15.0 American Idol (Thursday) 14.8 The Voice (Monday) 14.4 The Walking Dead 14.3 Dancing With the Stars (Tuesday) 14.0 Two and a Half Men 13.9 The Voice (Tuesday) 13.5 Blue Bloods 13.3 Elementary 13.3 Top Rated TV Programs: 2015 - 2016 Program Rating NFL Sunday Night Football 22.0 The Big Bang Theory 20.6 NCIS 20.5 The Walking Dead 18.9 NFL Thursday Night Football 17.7 Empire 16.2 NCIS: New Orleans 16.1 Blue Bloods 14.6 Dancing With the Stars 13.7 The X-Files 13.6 The Voice (Monday) 13.5 Scorpion 13.3 The Voice (Tuesday) 13.2 Little Big Shots 13.0 NFL Monday Night Football 12.9 \begin c.The main function of the respiratory system is gas exchange (O 2 and CO 2). The numbers of viewers include those who watched the program on any platform, including time-shifting up to seven days after the original telecast. ![]()
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