Gas exchange in bony fish
- Created by: Natasha Granville
- Created on: 16-04-18 18:42
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- Gas exchange in bony fish
- Gills
- organs of gas exchange
- contained in gill cavity
- covered by protective operculum
- bony gill arch under operculum
- supports gill structure
- bony gill arch under operculum
- covered by protective operculum
- gill filaments
- need a flow of water to stay apart
- exposes large surface area for gas exchange
- occur in large stacks (gill plates)
- need a flow of water to stay apart
- gill lamellae
- rich blood supply
- large surface area
- main site of gas exchange
- Mechanism
- buccal cavity (mouth opens) and volume increased
- opercular valve closes and pressure in buccal cavity drops
- water moves into buccal cavity and pressure increases
- water moves over gills
- water moves into buccal cavity and pressure increases
- opercular valve closes and pressure in buccal cavity drops
- buccal cavity (mouth opens) and volume increased
- Countercurrent flow
- water and blood flow in opposite directions
- ensures steep concentration gradient
- Gills
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