- A Thick
- B Thin
- C Irregular walled
- D Vascularized
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Answer:
A
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Alveoli are thin, irregular walled and vascularized sac-like structures. They are the main site for the diffusion of gases. Terminal bronchioles give rise to alveoli. Lungs without alveoli are considered dead lungs as they play a major role in respiration. Therefore, option A, which states that alveoli are thick, is incorrect. Instead, alveoli are thin-walled structures to allow for efficient gas exchange between the air and the bloodstream.
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