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MCAT Question A Day - 7/4/14 - Answer!

Parathyroid hormone is an important hormone in the control of blood calcium ion levels. Parathyroid hormone directly impacts:

I.  bone density
II.  renal calcium reabsorption
III.  blood calcium concentration

A.  I only
B.  I and II only
C.  I and III only
D.  I, II and III

D is correct. Parathyroid honnone stimulates osteoclast (bone resorbtion) activity. It also works in the kidneto slow calcium lost in urine. It controls blood calcium levels via these two mechanisms.