Simple squamous epithelium cells for gas exchange and fluid secretion in the lungs are known as what?
ALVEOLAR CELLS
The fluid secreted from alveolar cells contains ____________ which reduces the surface tension of the fluid, which reduces the tendency of alveoli to collapse.
SURFACTANT
Alveolar ______________ remove dust.
MACROPHAGES
Within alveoli, _____________ make reticular and elastic fibres.
FIBROBLASTS
What are alveoli are surrounded by?
CAPILLARIES
Gas exchanges happen through simple __________ across the alveolar and capillary walls, which together for the respiratory membrane.
DIFFUSION
Lungs get oxygen from the air, into the _________.
BLOOD
Lungs get __________ ___________ from the blood, and return it to the air.
CARBON DIOXIDE