A-Level Biology OCR A
Oxygen Tracheoles Insect Gas Tracheae Cell Outline Structure
| Front |
Outline the structure of the insect gas exchange system and describe the way oxygen reaches the body cells. |
| Back |
Insect gas exchange:- Oxygen enters through spriacles, into tracheae which branch into narrow tracheoles, moves by simple diffusion at rest
- Tracheae - waxy cuticle & rings of chitin make them impermeable
- Tracheoles - 1 each is 1 greatly elongated cell with no chiting lining - freely permeable to gases
- Oxygen dissolves in moist walls of tracheoles(tracheal fluid), diffusing across the single cell into tissue cells, CO2 in opposite direction
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A-Level Biology OCR A