How big do you think the surface area of the alveoli in one set of

human lungs is?

7 m2 70 m2 170 m2

Messenger and ScribeOrganise yourselves into groups of four.Nominate one person from your group to be messenger…

Memorise….

Recreate!

The alveoli

One cell thick - squamous epithelial cellsCovered in network of capillariesFolded Found in large numbers in the lungs

The alveoli under the microscope

Emphysema: based on the image alone – what do you think the symptoms of emphysema are?

Pneumonia: based on the image alone – what do you think the symptoms of pneumonia are?

Making NotesAlveoli as an Exchange Surface

Cells involved?Tissues involved?Main features?How do they apply to Ficks law?

ACBB