Which of the following exemplifies a positive feedback process happening in bone mineral deposition?
A) The first few crystals that form attract more calcium and phosphate.
B) Osteoblasts neutralize inhibitors that prevent bone resorption.
C) Osteoclasts secrete acid phosphatase that digests collagen.
D) Collagen is digested by enzymes and hydroxyapatite by hydrochloric acid.
E) Solubility product is reached in the tissue fluids.

Question

Quizplus · Accepted Answer

Positive feedback processes involve a self-reinforcing cycle where the initial action leads to more of the same action. In bone mineral deposition, the first few crystals that form attract more calcium and phosphate, which leads to more crystals forming and thus further attracting more calcium and phosphate. This is an example of a positive feedback process. None of the other options describe a positive feedback process. B is describing a neutralization process, C and D are describing processes of bone resorption, and E is describing reaching a solubility limit (which is not a feedback process).

Which of the Following Exemplifies a Positive Feedback Process Happening