fish

• inspiration in bony fish:

  • mouth opens
  • operculum closes
  • buccal floor lowers
  • volume of buccal cavity increases
  • pressure inside buccal cavity decreases
  • water flows into mouth from high to low pressure
• expiration in bony fish:

  • mouth closes
  • operculum opens
  • buccal floor rises
  • volume of buccal cavity decreases
  • pressure inside buccal cavity increases
  • water flows out of gills from high to low pressure