The glomerulus in the kidneys have a nice membrane that generally does not permit calcium to go through what happento kidney failure, the glomerular pores get large and calcium can get through and loss it.
Normally you don’t loss a lot of calcium through the urine because the filter is intact and the membranes are intact. The glumerulus however in Renal Failure you get to end up getting holes and membranes permits a lot of calcium to go through.
The funny thing here is that because of selective filtration while it permits a large molecule of calcium to go through it does not allow the small Potassium to go through. Remember that everything in our body is selective filtration, it permits this to go through and not that to go through.
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