4640838
Descrição
Mapa Mental por Fauzia Ali, atualizado more than 1 year ago
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Criado por Fauzia Ali
quase 9 anos atrás
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Gas Exchange-
Insects
- Active
- Movements of abdomen ventilate
the tracheae
- Ends of tracheoles fluid-filled and
close to muscle fibres
- Interface where gas
exchange takes place
- Oxygen dissoles in fluid and
diffues directly in muscle
cells
- No respiratory
pigment or blood
circulation need
- CO2 diffuses reverse
- Movements of abdomen ventilate
the tracheae
- Resting
- Diffusion through spiracles, tracheae
and tracheoles
- Same method for O2 and CO2
- Diffusion through spiracles, tracheae
and tracheoles
- Problems
- Live in arid so water evaporates from
body risking dehydration
- Gas exchange need thin permeable surface
conflicts with water conservation
- Insects therefore have waterproof layer (e.g.
exoskeleton with thin waxy layer over thick layer
of chitin and protein
- Insects therefore have waterproof layer (e.g.
exoskeleton with thin waxy layer over thick layer
of chitin and protein
- Live in arid so water evaporates from
body risking dehydration
- Structure
- Paired holes:spiracles
- Branches chitin lined tubes:tracheae
- Smalles tubes: tracheoles
- Smalles tubes: tracheoles
- Can open and close: reduces water loss
- Hairs on spiracles: reduces
water loss and prevents solid
particles entering
- Branches chitin lined tubes:tracheae
- Paired holes:spiracles
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