Adaptations of Gas Exchange Surfaces Crossword Puzzle

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QUESTIONS LIST:

counter current : fluids flowing in opposite directions
operculum : bony plate covering the gills
tracheae : rigid tubes that connect spiracles to tracheoles
chitin : polysaccharide that supports tracheae in insects
simple diffusion : gas exchange process across body surface in single-celled organisms
spiracles : pores in the exoskeleton segments that allow air to enter an insect
tracheoles : highly branched tubes where gas exchange takes place in insects
gill filament : branched structure connected to gill arch (also known as primary lamellae)
secondary lamellae : structures on gill filaments where gas exchange takes place in fish