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<TD>Which hormone is the main regulator of potassium??</TD>
 
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Aldosterone</font></TD>
<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#|Link]]</TD>
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<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Potassium and Aldosterone|Link]]</TD>
 
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<TD>In which two regions of the nephron is H<sup>+</sup> secreted?</TD>
 
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*Proximal tubule
<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#|Link]]</TD>
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*Collecting duct</font></TD>
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<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Acid / Base|Link]]</TD>
 
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<TD>What role do buffers play with regard to excreting hydrogen ions?</TD>
 
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Once all bicarbonate has been reabsorbed they combine with residual excess hydrogen allowing it to be excreted without the loss of bicarbonate and without making the urine very acidic.</font></TD>
<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#|Link]]</TD>
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<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Buffers of H+ in Urine|Link]]</TD>
 
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<TD>In ruminants fed low nitrogen diets more urea is reabsorbed.  Why?</TD>
 
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It is transported to the rumen and converted to microbial protein</font></TD>
<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#|Link]]</TD>
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<TD>[[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Urea and Foregut Fermenters|Link]]</TD>
 
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