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Bio_Fish_Gas_Exchang

The fish gas exchange system words

QuestionAnswer
Function of the gill filaments: main diffusion surface for O2 and CO2.
Describe gill filaments: soft feather like projections on the gill arch.
What is the function of the gill rackers? Filter out large particles in the water before it enters the gills.
What is the description of the gill rackers? Hard comb-like structure on the gill arch.
Explanation of the opperculum: Large particles could damage the gills or may block them. This reduces the surface area or it may restrict water flow to the lamellae and could slow down or prevent diffusion
What is the function of the opperculum? Protects the gills from debris in the water.
Describe opperculum? Hard bone/flap over the gills.
Explanation of the gill filaments: The red blood cells absorb oxygen and carry it away from the gills. This maintains a steep diffusion gradient for oxygen as the oxygen concentration is always lower in the cells compared to the water in the gills.
Describe the buccal cavity: Opening of the mouth.
The function of the buccal cavity: Allows water to enter the gas exchange system.
Explanation of the buccal cavity: Ventilation allows a steep diffusion gradient to be maintained at the lamellae as fresh water is with a higher concentration of oxygen is always brought to the gills. This maintains the rate of diffusion and gas exchange.
Description of the gill arch: hard, bone arch under the opperculum.
Function of the gill arch: Support the gill filaments
Explanation of the gill arch: The buccal cavity and opperculum muscles cause ventilation of the gills. During ventilation, pressure changes occur within the gills. These structures prevent the collapse of the filaments ensuring that gas exchange can always occur.
Created by: kates
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