Gas Exchange in Fish (AQA A-Level Biology): Flashcards
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What prevents gas exchange through fish body surface
What prevents gas exchange through fish body surface
Waterproof outer covering
Specialized internal gas exchange structures in fish
Specialized internal gas exchange structures in fish
Gills
Primary structure of each fish gill
Primary structure of each fish gill
Gill filaments
Tiny projections on gill filaments
Tiny projections on gill filaments
Gill lamellae
Function of gill lamellae
Function of gill lamellae
Dramatically increase total surface area for gas exchange
Countercurrent flow definition
Countercurrent flow definition
Water & blood flow in opposite directions across gill lamellae
% of oxygen extracted by countercurrent flow
% of oxygen extracted by countercurrent flow
Approximately 80%
% of oxygen extracted by parallel flow
% of oxygen extracted by parallel flow
Only 50%
Why countercurrent flow is more efficient
Why countercurrent flow is more efficient
Maintains diffusion gradient across entire gill lamella length
Why parallel flow is less efficient
Why parallel flow is less efficient
Reaches equilibrium quickly, stopping further diffusion