[Campbell Biology P.1060] Parathyroid hormone PTH primarily increases blood calcium levels by... | Practice Question

Parathyroid hormone PTH primarily increases blood calcium levels by which of the following mechanisms?

  • A: Promoting calcium excretion by the kidneys.
  • B: Stimulating calcium uptake by skeletal muscles.
  • C: Increasing calcium release from bone matrix.
  • D: Inhibiting the activation of vitamin D.

Explanation

Parathyroid hormone PTH directly acts on bones to cause the breakdown of the mineralized matrix, releasing Ca2+ into the blood. This is a primary mechanism for increasing blood calcium levels.