Question

7. Explain how exchange of gases takes place in
insects.​

Answer 1

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Gases move by diffusion within the tracheal system. When the insect is less active the ends of the tracheoles contain fluid. It is where the fluid and gas meet (= the fluid/gas interface), that exchange of gases occurs (oxygen is taken up, carbon dioxide is given off).

Answer 2

Answer:

Insects also have their own system for gas diffusion and they rely on spiracles.

Spiracles are used to get air into insects. Spiracles are tiny pores on the surface of insects through which air can pass into and out of the organism.

Insects use their tracheae as their gas exchange organ. The tracheae and tracheoles are lined with a single layer of cells to minimise the diffusion distance of gases.

Insects use rhythmic abdominal movements to move air in and out of the spiracles. This helps to remove the carbon dioxide from the body and get oxygen into the tracheae for gas exchange.

Finally, fish use gills and lamellae. Gills use a counter-current system. This ensures there is always a steep concentration gradient for oxygen to diffuse from the water into the blood.

Hope that this answer will help you!