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The blood vessels are attached to the shell and they are bright red. The veins are also nice and thick. As the movement of gasses depend on high and low potentials I would suspect that oxygen and carbon dioxide will exchange regardless of the presence of a porous shell. High oxygen levels outside the egg would allow for movement of oxygen into the blood that has a lower concentration of oxygen and vice versa for carbon dioxide. I have also done some Reading about the protective nature of the albumin and it's protective properties in regards to the embryo. Bacteria and micro organisms can not grow on the albumin as it prevents infection by creating a hostile environment for microorganisms and by acting as a microbicide ( Kohler, 2005).