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Question

Which one of the following is surrounded by a rich amount of capillaries?

A
Alveoli
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B
Bronchi
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C
Trachea
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D
Nostril
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Solution

The correct option is A Alveoli
The alveoli are surrounded by tiny blood vessels, called capillaries. It is the alveoli that receive the oxygen and pass it on to the blood.
Alveoli and capillaries both have very thin walls, which allow the oxygen to pass.
Trachea, also called the windpipe, is a cartilaginous tube that connects the pharynx and larynx to the lungs.
Nostril is either of the two external openings of the nasal cavity that allows air to enter the lungs.
Bronchi are the air passages into the lungs.

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