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Tracheal Gills - Respiration
In many species of aquatic insects the air in the trachae is replenished by diffusion of oxygen via tracheal gills. Many aquatic insects carry a temporary store of air as a bubble on the body surface which replenishes the air in tracheae during submergence. In other aquatic insects a constant volume of air is held as a thin layer close to the body surface by water repellent hair forming a plasteron (or layer of air).
As long as water is well aerated insects with plasteron can remain submerged for many months. As much as one-third or half of the total capacity of the air system can be emptied in one expiration giving a renewal of about half the volume of the respiratory system. This is much greater than in a mammal at rest, where in each breath only 1/5 of the air contained in the system is renewed.
(a) What are the intermediate products of anaerobic respiration in an active muscle? (b) Which of them is associated with oxygen debt? (c) In what way is th
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