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Aquatic respiratory systems primarily function through gills, which extract dissolved oxygen from water. Water enters the mouth, flows over the gill membranes, and exits through openings, allowing oxygen to diffuse into the blood while carbon dioxide diffuses out. This process is often assisted by a countercurrent exchange mechanism, where water flows in the opposite direction to blood flow, maximizing oxygen uptake. Overall, this system efficiently supports the metabolic needs of aquatic organisms.

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1mo ago

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