In article <38575897.2DB3 at erols.com>, Stuart Dunn <dunns99 at erols.com> wrote:
> The amount of calcium in urine had to be increased to maintain the pH
> level of it and that this had been proven.
Calcium has no effect what so ever on pH (of blood or urine). So what are
you refering to with the word "it"? Calcium is required to stay in the
blood/extracellular space at a concentration of about 3 mM and the body
will catabolize the bone to make it so ( see vitamin D utilization
pathway). Calcium is needed by the cells for a wide variety of tasks but
pH is not one of them.
BTW, If excess calcium is appearing in the urine then that is a marked
sign of a kidney disorder. ~10mg of calcium is removed by glomuelar
filtration BUT ~9.82mg is readsorbed in the proxiamal and distal tubules.
Thus about 175mg is all that will appear in the urine on any given day.
The majority of calcium excretion occurs in the gut NOT the kidney. And
calcium excretion has nothing to do with the ultrafiltration occuring in
the nephron.
Where are you getting your information?
If you want a good suggestion, get a good physiology book.
Peter Pediaditakis
Dept. of Pathology
University of Pittsburgh
