Excretion - getting rid of liquid & gaseous waste, Organs of excretion - lungs, skin, kidneys, , Wastes that need to be excreted - urine, water, sweat, carbon dioxide, heat, What reaction produces carbon dioxide? - cellular respiration, digestive system contributes to homeostasis by giving us - NUTRIENTS for cellular respiration, growth, and maintence, Respiratory System contributes to homeostasis by giving us - OXYGEN for cellular respiration, Circulatory system contributes to homeostasis by - absorbing and moving around nutrients & oxygen to all cells, carrying wastes to organs of excretion, LUNGS - exhale carbon dioxide & water, SKIN - sweats water, salts, urea, heat, KIDNEYS - filter blood and produce urine,

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