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Question
Choose the correct answer from the alternatives given.
The respiratory medium flows unidirectionally ever the respiratory surface in the gas-exchange systems of:
Choose the correct answer from the alternatives given.
The respiratory medium flows unidirectionally ever the respiratory surface in the gas-exchange systems of:
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Solution
The correct option is C birds
In birds, the air sacs permit unidirectional flow of air through the lungs. Unidirectional flow means that air moving through bird lungs is largely 'fresh' air & has a higher oxygen content. So, the correct option is 'birds'.
In birds, the air sacs permit unidirectional flow of air through the lungs. Unidirectional flow means that air moving through bird lungs is largely 'fresh' air & has a higher oxygen content. So, the correct option is 'birds'.
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