Which of these facts is true for the bronchioles but not the alveoli?A. large surface areaB. very good blood supplyC. walls are one cell thickD. lined with cilia
Question
Which of these facts is true for the bronchioles but not the alveoli?A. large surface areaB. very good blood supplyC. walls are one cell thickD. lined with cilia
Solution
To determine which fact is true for the bronchioles but not the alveoli, let's analyze each option:
A. Large surface area
- Both bronchioles and alveoli contribute to the large surface area of the lungs, but alveoli are specifically known for their extensive surface area to facilitate gas exchange.
B. Very good blood supply
- Alveoli have a very good blood supply as they are the primary site for gas exchange with the blood. Bronchioles, while having some blood supply, are not as richly supplied as alveoli.
C. Walls are one cell thick
- Alveoli have walls that are one cell thick to allow efficient gas exchange. Bronchioles have thicker walls compared to alveoli.
D. Lined with cilia
- Bronchioles are lined with cilia to help move mucus and trapped particles out of the lungs. Alveoli do not have cilia; they are specialized for gas exchange.
Therefore, the correct answer is:
D. Lined with cilia
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