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A-Level Biology OCR A

Oxygen Tracheoles Insect Gas Tracheae Cell Outline Structure

In insects, oxygen enters through spiracles, travels via tracheae and tracheoles, and dissolves in tracheal fluid to diffuse into cells. Tracheae have an impermeable waxy cuticle.

En los insectos, el oxígeno entra por los espiráculos, viaja por las tráqueas y traqueolas, y se disuelve en el líquido traqueal para difundirse a las células. Las tráqueas tienen una cutícula cerosa impermeable.

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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