Welcome to the Quiz!
This quiz contains 7 questions from a mix of 1 subtopics.
Which of the following is NOT a reason why bony fish have evolved specialised respiratory systems?
bony fish have scaly skin that enhances gas exchange
water is denser and more viscous than air, resulting in slower diffusion
water has less oxygen than air
bony fish are very active so have high oxygen demands
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What structure directly covers the gills of bony fish?
filaments
operculum flap
lamellae
scales
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Which of the following is NOT an adaptation of gills for efficient gas exchange?
parallel flow of blood and water
rich blood supply
thin layers of gills
large surface area
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What does the countercurrent flow of blood and water in gills mean?
blood and water do not flow
blood and water flow in the same direction
blood and water flow in opposite directions
blood and water flow at different speeds
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Which of the following is true about the countercurrent exchange principle in fish gills?
it reduces the diffusion of oxygen into the blood
it allows oxygen-rich blood to meet water that has had most of its oxygen removed
it enables less efficient gas transfer than parallel flow
it maintains a steep concentration gradient across the entire gill
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Which of the following is an adaptation of gills for efficient gas exchange?
overlapping filament tips increase resistance, speeding up water flow over gills
overlapping filament tips increase resistance, slowing water flow over gills
overlapping filament tips decrease resistance, speeding up water flow over gills
overlapping filament tips decrease resistance, slowing water flow over gills
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Explain how the countercurrent exchange system in fish gills enables efficient gas transfer.
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