Some fish use head muscles and structures to move water over their gills, while others swim with their mouths held open to get the same effect. We breathe air in and out to do this, but some insects pump their bodies to draw in air, and sponges may have special cells with tails (flagella) to make fresh water move over their cells. Ventilation is the passage of fluid (for example, air or water) along surfaces that can absorb oxygen (called respiratory surfaces). What we call breathing, the movement of air in and out of our lungs, is called ventilation by scientists and doctors. Click for a larger image of this frog fish.īefore we delve into these specifics though, let’s get a few terms straightened out. Most fish ventilate their gills by opening and closing their mouths.
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