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IBDP Biology: Gas exchange in an insect

Gas exchange in an insect

· biology,IB biology,IBDP BIOLOGY,gas exchange,insect

In this topic of IBDP Biology, we will learn about gas exchange in an insect.

Gas exchange in an insect

  • When it comes to IBDP Biology, insects were the first terrestrial animals.
  • Insects exchange oxygen and carbon dioxide between their tissues and the air.
  • Use a system of air-filled tubes called tracheae.
  • Tracheae open to the outside through small holes called spiracles.
  • The walls of the tracheal tubes are stiffened with bands of chitin.
  • These, in turn, lead to ever-finer branches.
  • The branches penetrate to every part of the body.
  • Tracheoles at the ends may be less than 1 µm in diameter
  • Every cell in the insect's body is adjacent, or very close to, the end of a tracheole.
  • Even so, there is a limit to the pressure they can withstand without collapsing.
  • This may be one reason why insects are relatively small.
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Reducing water loss

  • When it comes to IBDP Biology, water vapour as well as carbon dioxide diffuses out of the spiracles.
  • This could lead to dehydration in dry environments.
  • The spiracles are guarded by valves.
  • These are controlled by muscles that enable the grasshopper to open and close them.
  • When oxygen demand is less, they partially close the spiracles.
  • There are hairs that filter out dust as the air enters the spiracles.
  • These also trap moisture, reducing water loss.
  • They also have a waterproof cuticle

Ventilation of the Tracheal System

  • In smaller or less active insects, gas exchange though the tracheal system is by simple diffusion.
  • Large, active insects like grasshoppers, forcibly ventilate their tracheae.
  • Contraction of muscles in the abdomen compresses the internal organs and forces air out of the tracheae.
  • As the muscles relax, the abdomen springs back to its normal volume and air is drawn in.
  • Large air sacs attached to portions of the main tracheal tubes increase the effectiveness of this bellows-like action.

Maximising gas exchange when active

  • When it comes to IBDP Biology, at rest, water tends to accumulate in the tracheoles.
  • When active, lactic acid accumulates in the muscle cells.
  • This reduces the water potential of the cells.
  • Water passes from the tracheoles into the muscle cells by osmosis.
  • This increases the surface area and reduces the diffusion distance for gas exchange,

This is the end of this topic.

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