Gas Exchange Flashcards
1
Q
Fick’s law
A
Rate of diffusion
= (Difference in conc. x Surface area) / Diffusion distance
2
Q
Movement of oxygen in insect
A
- Enters insect through spiracles into tracheae
- spiracles close
- oxygen diffuses through tracheae into tracheoles (DOWN concentration gradient)
- O2 delivered directly to respiring tissues
3
Q
Adaptations of insect to limit water loss
A
Waterproof coating; rigid exoskeleton covered with waterproof cuticle
Relatively small SA: Vol ratio to minimise area over which water is lost
