main types of tissues/cells in the human lungs

cartilage

-provides strength to trachea & bronchus
-holds open the airways (so there is little resistance to airflow)

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Goblet Cells

secrete mucus - mucus is sticky & collects particles of dust, spores and pathogens

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ciliated epithelial cells

move mucus up the airway towards the mouth

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smooth muscle

-contact to narrow airways
-relax to widen airways
=control the flow to alveoli

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squamous epithelium

provides a short diffusion pathway for O2 and
CO2 in the alveoli

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elastic fibres

-stretch when breathing in & filling the lungs
-recoil when breathing out to help force air out of the lungs

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secrete mucus - mucus is sticky & collects particles of dust, spores and pathogens

Goblet Cells

move mucus up the airway towards the mouth

-contact to narrow airways
-relax to widen airways
=control the flow to alveoli

provides a short diffusion pathway for O2 and
CO2 in the alveoli

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