level.
Answer:
Parathyroid hormone and
calcitonin results in the fluctuation of 
level. Parathyroid Hormone
(PTH) increases the levels in
the blood. PTH acts on the bones and stimulates the process of bone reabsorption
(dissolution/demineralisation).
PTH also stimulates
reabsorption of by the
renal tubules and increases absorption
from the digested food.
Calcitonin is a
32-amino acid linear polypeptide hormone, that is produced in humans primarily
by the parafollicular cells of the thyroid. It acts by reducing blood calcium 
levels opposing the
effect of Parathyroid Hormone (PTH).
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