Water flows over gills in the opposite direction as blood flow in a process known as

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Water flows over the gills in the opposite direction to blood flow in a process known as countercurrent exchange. This facilitates the diffusion of oxygen from the water into the blood and the removal of carbon dioxide from the blood into the water. This mechanism allows for efficient gas exchange and is seen in many aquatic organisms, including fish and sharks.

Water Flows Over Gills in the Opposite Direction as Blood