Gas exchange in bony fish
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13 Terms
what is the conc in water
lower conc of O2 in water then air
what does the gill made of
Several gill filaments
what do the gill filament give
a big surface area for gas exchange
what are the gill filament covered with
gill plates
what do gill plate give
increase the SA even more
what are the gill supported by
gill arch
what speeds the length of diffusion
a network of capillaries
counter-current system (conc gradient)
blood flows through the gill plate in one direction and water flows the opposite
what happens when a fish opens its mouth
lowers the floor of the buccal cavity increasing the volume of it
what happens when the volume of the buccal cavity increases
decreasing the pressure inside sucking water in
what happens when the fishes mouth closes
floor of the buccal cavity rises volumes decreases
what happens when the buccal cavity volume decreases
pressure increases forcing water out of the cavity across gill filaments
what is the operculum and what does it do
bony flap that covers each gill the increase in pressure forces it to open letting water out
