Final answer:
When dietary intake of calcium is low, Parathyroid hormone will stimulate bone resorption to raise serum calcium level.
Step-by-step explanation:
When blood calcium levels are low, the parathyroid hormone (PTH) stimulates the release of calcium ions from bone matrices and increases the reabsorption of calcium by the kidneys. PTH also upregulates the activation of vitamin D in the kidney, which then facilitates intestinal calcium ion absorption. Therefore, when dietary intake of calcium is low, PTH will indeed stimulate bone resorption to raise serum calcium levels. Therefore, the statement is true.