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Single Choice Easy

Q What is not a characteristic of alveoli?

ID: #10000 Respiratory system 249 views
Question Info
#10000Q ID
EasyDifficulty
Respiratory systemTopic
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  • A Thick ✔ ✖
  • B Thin ✔ ✖
  • C Irregular walled ✔ ✖
  • D Vascularized ✔ ✖
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Explanation

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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