Question

in normal adult bones, a portion of the protein and mineral content is replaced each year. osteoclasts continue to be active long after osteoblast activity ceases. there is no turnover of minerals. exercise will have no effect on bone remodeling. osteoblast activity exceeds osteoclast activity, once bone has been formed.

Explanation:

In normal adult bones, bone - remodeling is a continuous process. Osteoblasts (bone - forming cells) and osteoclasts (bone - resorbing cells) are both active. A portion of the protein and mineral content is replaced each year through this remodeling process. Exercise stimulates bone remodeling. Osteoblast and osteoclast activities are balanced in normal adults, not one exceeding the other. Minerals do turnover, and osteoclasts do not remain active long after osteoblast activity ceases as they work in concert.

Answer:

a portion of the protein and mineral content is replaced each year.