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Question
Which of the following animals possess non-elastic lungs with elastic air sacs connected to them?
Which of the following animals possess non-elastic lungs with elastic air sacs connected to them?
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Solution
The correct option is C Birds
- Birds have non-distensible lungs. They are non-elastic.
- The lungs do not change their size during the process of breathing. The lungs of the birds are formed by the small air chambers.
- The chambers are made of squamous epithelium. There are very thin-walled air sacs which are continuous with the lungs.
- These air sacs help to draw air by creating a force during breathing without changing the size of the lungs.
Thus, the correct answer is option B.
- Birds have non-distensible lungs. They are non-elastic.
- The lungs do not change their size during the process of breathing. The lungs of the birds are formed by the small air chambers.
- The chambers are made of squamous epithelium. There are very thin-walled air sacs which are continuous with the lungs.
- These air sacs help to draw air by creating a force during breathing without changing the size of the lungs.
Thus, the correct answer is option B.
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