CH7 ventilation and exchange in insects Flashcards
1
Q
Where does gas exchange occur in insects
A
- spiracles
2
Q
How are spiracles opened and closed
A
- sphincters
- in order to minimise water loss
3
Q
When will the spiracles be open
A
- oxygen demand high
- carbon dioxide levels build up
4
Q
What are the tracheae
A
- tubes that carry air into insect body
- kept open by chitin
5
Q
What do tracheae branch into
A
- tracheoles
- single, elongated cell with no chitin lining
- freely permeable to gases
6
Q
What is tracheal fluid
A
- limits penetration of air for diffusion
- towards end of tracheoles
7
Q
What are adaptations for insects with higher energy demands
A
- mechanical ventilation of tracheal system
- collapsible enlarged tracheae
