EVERYDAY SCIENCE

Detailed explanation-1: -When mineral levels in the blood are too high, bones absorb some of the minerals and store them as mineral salts, which is why bones are so hard. When blood levels of minerals are too low, bones release some of the minerals back into the blood, thus restoring homeostasis.

Detailed explanation-2: -The skeletal system helps maintain mineral homeostasis by regulating the level of calcium and other minerals in the blood by storing or releasing them from bones as needed. This process also helps maintain homeostasis in blood pH because the minerals are basic.

Detailed explanation-3: -The central cavity of long bones is filled with marrow. The red marrow is responsible for forming red and white blood cells. It stores and releases minerals and fat.

Detailed explanation-4: -Bone-mineral homeostasis (homoióstasis = equilibrium in Greek) is the result of the interplay of two intertwined endocrine circuits formed by the feedback-regulated actions of 1, 25-dihydroxyvitamin D3 (1, 25-(OH)2D3) and parathyroid hormone (PTH).

Detailed explanation-5: -Bone resorption is resorption of bone tissue, that is, the process by which osteoclasts break down the tissue in bones and release the minerals, resulting in a transfer of calcium from bone tissue to the blood.