GAS EXCHANGE IN FISH Flashcards

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1
Q

what do bony fish have

A

waterproof scales
small SA:V

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2
Q

describe gills in fish

A

gills are made from gill filaments (thin plates) that are stacked up
gill lamellae ( on the upper and lower surfaces of the filaments) are perpendicular to the filaments
as water passes through the gills - gas exchange occurs at the lamellae

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3
Q

describe the adaptations for gas exchange in fish

A
  1. many gill filaments / lamellae means a large total surface area
  2. single layer of thin epithelial cells so a short diffusion pathway
  3. dense network of capillaries underneath also providing a short pathway
  4. fish pushes water over the gills providing constant ventilation
  5. counter current system maintains conc gradient
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4
Q

what is the counter current system

A

flow of blood and water over the lamellae is in opposite directions

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5
Q

why is parallel flow bad

A

the diffusion gradient is only maintained for half the distance of the lamellae so only 50% of oxygen diffuses in

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