Gaseous exchange in single celled organism and insects (edit) Flashcards
Why do singles cell organisms not have a mass transport system
They have a very small SA:V so O2 can be absorbed by diffusion
What is the internal network in insects for gaseous exchange called
Tracheae
These divide into tracheoles
3 ways respiratory gases move in and out of the tracheal system
Along diffusion gradient
Mass transport - Contraction of muscles
Ends of tracheloes filled with water - Lactate decreases water potential, water moves from tracheoles to muscle cells, decreases pressure so gas is drawn up behind and moves down pressure gradient
What controls the entering and leaving of respiratory gases in insects
Spiracles, controlled by a valve
Limitation of tracheal system
Diffusion pathway limits possible size of the insects
Relies on diffusion
