Lecture 27 - BIOL104-04 Principles of Biology I November 1,...

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Unformatted text preview: BIOL104-04 Principles of Biology I November 1, 2010 Lecture #27 Ch 46 The Endocrine System Water Balance Water is the most abundant molecule in the body 50% of total body weight in females 60% of total body weight in males Averaged sized man contains about 42L Daily water intake & excretion are balanced Dee Human Physiology 4th ed figure 20-2 Kidneys conserve water Some solutes and water leave the body in urine The volume that is excreted can be regulated Kidneys cant replenish lost fluid; all they can do is conserve fluid loss Human Physiology 4th ed. Figure 20-3 Regulation of urine concentration The osmolarity of urine is a measure of how much water is excreted by the kidney When the body needs to eliminate excess water the kidney produces dilute urine When the body needs to conserve water the urine becomes very concentrated Kidneys alter urine concentration by varying the amount of water & Na + reabsorbed Regulating urine concentration To produce concentrated urine...
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 27 - BIOL104-04 Principles of Biology I November 1,...

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