fish and insects Flashcards
where does water enter the fish
through the mouth
where does water leave the fish
through the gills
what is each gill made from
gill filaments
what do gill filaments give
large surface area
what are gill filaments covered in
secondary lamellae
what is the purpose of secondary lamellae
increase surface area further
what is each gill supported by
gill arch
how are gills adapted for diffusion
lots of blood capillaries and a thin surface layer of cells
what is a counter current system
blood flows through the gill plates in one direction and water the other way
what is the purpose of a counter current system
maintains a large concentration gradient between water and blood
where is the conc of oxygen always higher
higher in water than in blood
when a fish opens its mouth, what lowers
the buccal cavity
what is the buccal cavity
space inside the mouth
