PATHOLOGY MCQ
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: -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-3: -In addition, the most active insects have large thin-walled dilatations of the tracheae called air sacs, which serve to increase the volume of air displaced during respiratory movements.