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Which of the following statements is true?
By the age of 21, the width of the bones stops changing.
PTH will increase calcium deposits in the bone matrix.
After the age of 21, most people will not experience longitudinal growth of bones. Hormones determine where remodeling occurs within the skeleton.

Answer :

Bone remolding, which occurs continuously throughout life to maintain a sturdy skeleton and becomes dominant when that bone reaches its peak mass, is the reasonable activity of bone resorbing osteoclasts and bone forming osteoblasts.

  • Redesigning continues throughout life, thus a significant component of the adult skeleton is periodically replaced.
  • PTH stimulates osteoclasts' bone resorption, but it does so implicitly. Osteoblasts have PTH receptors, which signal to bone marrow-derived osteoclast precursors to activate their fusion, segregation, and actuation.

A variety of fundamental hormones, as well as regional administrative elements that affect the hereditary characteristics of osteoclast and osteoblast cells, regulate the remolding of bone.

  • duplicate cells that are identical.
  • the cell's enrollment.
  • the various tasks that each type of cell carries out.

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