(FISH) RESP STRUCTURE AND MECHANISM OF BREATHING

• What are the respiratory structures of fish called?

  Gills
• What are gills made up of?

  Filaments
• What supports the filaments in fish gills?

  They are supported by a structure called the arch.
• What do filaments in fish gills contain?

  Numerous lamellae
• Why is the large number of lamellae in fish gills important?

  It provides a large surface area for gas exchange.
• What is the membrane of lamellae supplied with?

  Blood vessels
• What is the function of the blood vessels in the lamellae?

  They facilitate the transport of gases for respiration.
• What is the role of the mouth in fish respiration?

  It allows water to enter the buccal cavity.
• What happens to the pressure in the buccal cavity during respiration?

  The pressure in the buccal cavity decreases.
• How does water flow through the gills of fish?


  Water flows out through the operculum.
• What is the role of the operculum muscle in fish respiration?

  It helps to create pressure changes in the opercular cavity.
• How does the pressure in the buccal cavity compare to the pressure outside during respiration?

  The pressure in the buccal cavity is lower than the pressure outside.
• What are the steps involved in the respiratory process of fish?

  1. Water enters through the mouth into the buccal cavity.
  2. The operculum muscle contracts, decreasing the volume of the buccal cavity.
  3. Pressure in the buccal cavity decreases, allowing water to flow out through the operculum.
  4. Gas exchange occurs in the gills.