The following statements about the parathyroid hormone are true, EXCEPT:
a) The parathyroid hormone (PTH) is a single-chain peptide hormone composed of 84 amino acids
b) The parathyroid hormone increases calcium and phosphate absorption in intestine (by increased 1,25- dihydroxyvitamin D3 production)
c) The parathyroid hormone increases serum calcium and decreases serum phosphate
d) The parathyroid hormone increases calcium excretion and decreases phosphate excretion in kidneys
