The surfactant, also they have only one layer of squamous epithelial tissue, they have no mucus membranes, grape like cluster, one single thick cell.
k.joseph
The alveolis.
The alveolis.
gaseous exchange - in the alveolis
the respiratory surface for protists is the alveolis and capillaries
Alveoli alveoli - air sacs in your lungs
There isn't an air sac in the lungs, They're alveolis that take in the air and expand to improve their surface area, causing your diaphragm to expand and shrink when you breathe, but the function is to allow you to respire.
alveoli. they are the basic functional unit of the lungs. it is where gas exchange occurs.
No unique can not be nulll....unique must have any unique value for unique identification.,...
It is a unique code.
The correct spelling is "unique."
"Unique, New York, Unique, New York, Unique, New York, Unique, New York, Unique, New York, Unique, New York, Unique, New York, Unique, New York, Unique, New York," keep on saying it a lot, and soon you'll be saying: "Unique, you York!"