GAS EXCHANGE IN INSECTS Flashcards
1
Q
terrestrial insect gas exchange (2)
A
- thin permeable surface
- large area
2
Q
how do insects prevent dehydration? (3)
A
- waterproof layer covering body i.e exoskeleton
- spiracles open and close when needed
- hairs covering spiracles prevent solid particles getting in
3
Q
what is an insect exoskeleton made from? (2)
A
- chitin and protein
- waxy layer
4
Q
spiracles (3)
A
- paired holes
- where gas exchange occurs
- run alongside body
5
Q
tracheae (3)
A
- branched pipes from spiracles
- lined with chitin
- fluid-filled, close to muscle fibres
6
Q
tracheoles
A
- smaller tubes
7
Q
how do insects take in o2 when resting?
A
- diffusion through spiracles, tracheae, tracheoles
8
Q
how do insects take in o2 in flight?
A
- movement of abdomen ventilates tracheae
9
Q
why do insects have no respiratory pigment?
A
- interface between tracheae is where ge occurs, directly in and out of muscle fibres so no circulation needed
