The transfer of oxygen and other gases between air in the lungs and blood vessels takes place at the
A
Pharynx
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B
Diaphragm
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C
Trachea
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D
Alveoli
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Solution
The correct option is D Alveoli Lungs have numerous air sacs called alveoli. They are rich in blood vessels and have a very thin membranous layer through which exchange of gases takes place.