1. Blood in the gills runs in the opposite direction as the water outside the gill filaments. By running in the direction opposite the flow of water, the blood is always exposed to an area of water that has a higher level of oxygen. Oxygen moves across the membranes by diffusion. So if the gill had more oxygen than the water, the fish would lose oxygen to its surroundings. This is an example of:
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Home » Biology » 1. Blood in the gills runs in the opposite direction as the water outside the gill filaments. By running in the direction opposite the flow of water, the blood is always exposed to an area of water that has a higher level of oxygen.