This card explains the mechanics of a fish's ventilatory system, detailing how mouth and operculum movements create water flow over the gills and expel waste water.
Tato karta vysvětluje, jak funguje ventilační systém ryb, včetně mechanismů otevírání a zavírání úst a víček pro proudění vody přes žábry a následné vyloučení odpadní vody.
| Front | How ventilatory system works 3.1.1(f) |
|---|---|
| Back | - if mouth opened, Buccal cavity floor lowered (inc vol of BC, so pressure dec), water moves in and at same time, opercular valve shut and opercular cavity (with gills) expands (dec pressure in opercular cavity), floor of BC moves up (inc pressure, so water moves from BC over gills) - if mouth closes, operculum opens and sides of opercular cavity move inwards (inc pressure in opercular cavity), forcing water over gills and out of operculum, floor of BC moves up, maintaining flow of water over gills |
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