2.2: Adaptations for gas exchange in insects Flashcards
Why can’t insects use their external surface for gas exchange?
Because they are covered in an impermeable cuticle to reduce water loss by evaporation.
What happens during flight for an insect?
Fluid in tracheoles decreases to
shorten diffusion path and whole-body contractions ventilate the tracheal system by
speeding up air flow through spiracles.
Why does the fluid in tracheoles decrease during flight?
To shorten diffusion paths.
Where does gas exchange occur through?
Paired holes called spiracles.
What do spiracles lead to??
A system of branched, chitin lined air tubes called trachae.
What is a characteristic of spiracles?
They can open and close like valves.
Why would a spiracle close?
When at risk of dehydration.
What are trachae ventilated by?
Activity.
Do insects have a short diffusion distance?
Yes, as oxygen is taken directly to cells.
Air enters from the what and leaves out the?
Enters from the thorax and leaves through the abdomen.
