gas exchange in insects Flashcards
what does the tracheal system do in small insects?
diffusion
what can spiracles do?
open and close to reduce water loss
what is in the tracheal system made of?
spiracles
trachea
tracheoles
what does the tracheal system do in large inescts?
ventilation
what is at the end of tracheoles?
small amount of fluid close to muscle fibres which gases diffuse into
what are tracheae?
branching system of chitin-lined air tubes
what does ventilation do?
maintains concentration gradient
movement of air to supply O2 and remove waste products
what is ventilation like in insects?
one way air flow through major tracheae
in through thoracic and first 2 abdominal spiracles
out through remaining abdominal spiracles
how is air moved in insects?
by contraction and relaxation of muscles
change in volume and pressure of abdomen
what happens in inspiration in insects?
thoracic and first 2 abdominal spiracles open
abdomen expands
increase in volume
decrease in pressure
air flows in
what happens in expiration of insects?
thoracic and first 2 abdominal spiracles close
other abdominal spiracles open
abdomen contracts
decrease in volume
increase in pressure
air flows out