lungs- lobed and highly branched tubules
trachae-ring of cartilage- prevents collapse when pressure falls
flexible airway, goblet cells- produce mucus- traps dirt
bronchi- supported by cartilage, two divisions of trachea- mucus
cilia- move dirt into stomach
bronchioles- branching sub-divisions, muscle layer- controls blood flow
collagen- fibrous protein that is the main constiuent of connective tissue such as tendons, cartilage and bone
alveoli- easily damaged, lined with epithelial cells
red blood cells slow- squamas- allowes time for diffusion
1 cell thick- thin diffusion path- large SA:V
air constantly moving, blood constantly moving- maintain diffusion gradient
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