Regulating the Internal Environment notes

Regulating the Internal Environment notes - Regulating the...

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Regulating the Internal Environment Conformers vs. Regulators   Two evolutionary paths for organisms regulate internal environment maintain relatively constant internal conditions conform to external environment allow internal conditions to fluctuate along with external changes Homeostasis  Keeping the balance animal body needs to coordinate many systems all at once temperature blood sugar levels energy production intracellular waste  disposal nutrients ion balance cell growth maintaining a “steady state” condition Animal systems evolved to support multicellular life overcoming limitations of diffusion Evolution of exchange systems to support multicellular organisms o circulatory system    distributing nutrients o excretory system  removing wastes Osmoregulation Water balance  freshwater hypotonic saltwater hypertonic water loss from cells land dry environment need to conserve water may also need to conserve salt Why do all land animals have to conserve water? may lose life while searching for water Intracellular Waste what do we digest our food into…
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carbohydrates = CHO  CO 2  + H 2 O lipids = CHO  CO 2  + H 2 O nucleic acids = CHOPN     CO 2  + H 2 O + P + N (little N) proteins = CHON     CO 2  + H 2 O + N (lots of N) Animals poison themselves from the inside by digesting proteins Nitrogenous waste disposal Ammonia (NH 3 ) very toxic (carcinogenic) very soluble (easily crosses membranes)
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Regulating the Internal Environment notes - Regulating the...

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