How does carbon dioxide exit the bloodstream at its final destination? Why does it move in the direction that it does across the alveolar surface?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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How does carbon dioxide exit the bloodstream at its final destination? Why does it move in the direction that it does across the alveolar surface?  

When you feel a pulse, you’re feeling your radial artery expand.  What is causing your artery to expand like this? 

The veins in your arms and legs have one way valves.  Explain why these valves are necessary for returning venous blood to the heart. 

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