capillary networks - Allow the exchange of materials at cellular level, lungs - Gas exchange organs, alveoli - Thin walled air sacs in the lungs where gas exchange takes place., oxygen - Absorbed into the blood capillaries from the alveoli., carbon dioxide - Asorbed into the alveoli from the blood capillaries., villi - Thin-walled folds in the small intestine wall., capillaries in the villi - Absorb glucose and amino acids, lacteal - Absorbes fatty acids and glycerol,

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