ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Decrease the rate of exchange of respiratory gases between tissues and the surroundings
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Increase the rate of exchange of respiratory gases between the cells
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The air sacs are filled with air
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The air sacs are filled with water
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Detailed explanation-1: -Air Sacs. In some insects air sacks help to ventilate (push air in / out of) the tracheal tubes when the insect is moving. The muscular contractions associated with body movements (especially flying) also rhythmically compresses the tracheal tubes facilitating ventilation.
Detailed explanation-2: -Tracheae connect with the atmosphere through openings called spiracles, which usually have closable valves. Some insects, including grasshoppers, have air sacs that are enlarged tracheae lacking the normal exocuticle and taenidia and are hypothesized to act as bellows to aid convective airflow (for review see Refs.
Detailed explanation-3: -Instead of nostrils, insects breathe through openings in the thorax and abdomen called spiracles.
Detailed explanation-4: -Air sacs are found as tiny sacs off the larger breathing tubes (tracheae) of insects, as extensions of the lungs in birds, and as end organs in the lungs of certain other vertebrates. They serve to increase respiratory efficiency by providing a large surface area for gas exchange.
Detailed explanation-5: -Air sacs serve as internal compartments which hold air and facilitate internal air passage to allow birds to have a continuous flow of large volumes of air through the lungs as a way to increase oxygen exchange capacity and efficiency.