EVERYDAY SCIENCE

Detailed explanation-1: -A typical pair of human lungs contain about 300 million alveoli, providing a total surface area for gas exchange of between 70 and 80 square metres.

Detailed explanation-2: -In six adult human lungs, the mean alveolar number was 480 million (range: 274-790 million; coefficient of variation: 37%). Alveolar number was closely related to total lung volume, with larger lungs having considerably more alveoli.

Detailed explanation-3: -There are around 300 million air sacs in your lungs and if they were spread out, they would cover an area roughly the size of a tennis court!

Detailed explanation-4: -There are about 300 million alveoli in both Lungs which increase the surface area for the exchange of respiratory gases.

Detailed explanation-5: -Dunnill estimated a mean number of 286 million alveoli in a human lung of a 55-year-old female (27). In 32 human lungs aged 19 to 85 years, Angus and Thurlbeck estimated a mean of 375 million alveoli (28).