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Bring oxygen from lungs to cells of the body.

Gas exchange in capillaries between blood and tissue cells.

Gas exchange between blood and air at alveoli.

Air moves in and out of lungs

A thin muscular membranous dome- shaped muscle that separates the thoracic and abdominal cavities.

Tiny sacs within our lungs

The smallest airways

Composed Carbon and hydrogen

element present in organic compounds

simplest alkane