A) capillaries surrounding the tissue cells
B) arteries of the .body
C) capillaries surrounding the alveoli
D) left auricle of the heart
Correct Answer: A
Solution :
Gaseous exchange between blood and alveolar air across respiratory membrane occurs by simple diffusion. The blood drained from lungs includes not only oxygenated blood but also some deoxygenated blood that has supplied its oxygen to tissue cells. The \[{{P}_{{{O}_{2}}}}\]of this blood is about 95-97 mm Hg. After receiving this blood from the lungs, the heart pumps it into the arteries, which carry it to all parts of the body, while flowing through the capillary networks in various tissues, this blood supplies \[{{O}_{2}}\] to all cells in exchange of \[C{{O}_{2}}\]. The pressure difference between tissue fluid (40 mn Hg) and arterial blood (95 mm Hg) ensure very rapid deoxygenations of unstable oxyhemoglobin in the tissue.
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