Gas excahnge in insects
- Created by: Natasha Granville
- Created on: 16-04-18 17:49
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- Gas exchange in insects
- Spiracles
- small openings in the thorax and abdomen
- air enters and leaves and water is lost
- Sphincters
- open and close spiracles
- mostly closed to minimise water loss
- open when oxygen demand is high or when carbon dioxide levels buid up
- Tracheoles
- trachea branches into tiny tracheoles
- tracheoles spread throughout all the tissues
- exchanging gases between cells
- freely permeable to gases
- no chitin
- freely permeable to gases
- exchanging gases between cells
- tracheoles spread throughout all the tissues
- no chitin
- air moves by diffusion
- numerous
- increases surfaces area
- tracheal fluid at the ends of tracheoles
- limits penetration of air for diffsusion
- helps control the surface area available for gas exchange and water loss
- limits penetration of air for diffsusion
- trachea branches into tiny tracheoles
- Trachea
- tubes leading away from spiracles and running along the insect's body
- lined with chitin spirals
- impermeable to gases
- not much gas exchange takes place
- keep trachea open if it is bent or pressed
- impermeable to gases
- air moves by diffusion
- Tough exoskeleton
- no gas exchange can take place
- Need exchange systems to deliver oxygen directly to and remove carbon dioxide directly from cells
- No blood pigments that carry oxygen
- Need exchange systems to deliver oxygen directly to and remove carbon dioxide directly from cells
- no gas exchange can take place
- No blood pigments that carry oxygen
- Spiracles
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