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excretion

Excretion questions and answers

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Excretory System Read Kraus pages 248 to 250. List the many different?functions of the skin: There are four different functions for the skin. The skin acts as a protective organ, meaning that the skin provides defense from mechanical injury and bacterial infections. How does the liver assist with excretion of nitrogenous?waste? The liver assists with the excretion of nitrogen waste. When humans eat food containing a surplus in protein, an excess of amino acid forms. Amino acid contains nitrogen. If the protein is not used to repair the body or help it grow, it is changed in the liver into nitrogenous waste and is secreted. This is why doctors warn about the excess consumption of foods like meat, fish, and eggs.

Biology Notes

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Unit I: The Concept of Life Biology : The Study of Life How is Life Defined? Key Idea: All living things carry out eight essential life functions. Collectively, the eight life functions are known as metabolism. Nutrition: the process in which food (organic molecules) is absorbed (ingestion) and used or broken down (digestion). Transport: the process in which material is moved from one place to another (circulated) within organisms. Active Transport: the type of transport that moves material from a low to high concentration while using energy.

Excretion notes

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Dr. M. Nedwidek; Stuy HS Linda Luu 12/18/09 SL1-05 (pds 3+4) Aim: How are wastes filtered from blood? Intro: Just as gas exchange provides the raw materials for energy production, excretion gets rid of wastes in the volume of wastes and liquids in one?s body; must be homeostatically maintained or kept constant-at equilibrium. (Blood is at equilibrium.) Mammalian urinary systems remove waste. Vertebrate Urinary/Excretory Systems Function to: Regulate blood levels of ions Regulate H2O content of blood Maintain proper pH of blood Retain glucose and amino acids in blood (nutrients) Secrete hormones (like erythropoietin) Eliminate cellular wastes like urea Urine is a product of urea which results from amino acid metabolism.
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