Final answer:
The answer to which substance is stored in bones from the given choices is phosphate. Bones store calcium and phosphate ions, both essential minerals for body functions, regulated by hormones such as PTH and calcitonin.
Step-by-step explanation:
The question 'Which of the following is stored in bones?' relates to the storage functions of bones in the human body. The correct answer is phosphate.
Bones are a vital part of the human body as they serve multiple functions, including the storage of essential minerals. Bones store calcium and phosphate ions, which are critical for various bodily functions. When blood calcium levels are low, parathyroid hormone (PTH) stimulates the release of calcium from bones into the bloodstream. The hormone calcitonin helps to deposit calcium into the bones when the plasma ionized calcium levels are high. Both calcium and phosphate are regulated through PTH, dihydroxyvitamin D (calcitriol), and calcitonin. Therefore, the substances stored in bones from the options provided are calcium and phosphate, with the specific answer to the question being phosphate.