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Bones

Bones are rigid organs that form part of the endoskeleton of vertebrates. They provide structure, protect organs, anchor muscles, and store calcium.

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Bones are composed of a dense matrix made up of collagen fibers and mineral salts.
The human skeleton is divided into two parts: the axial skeleton and the appendicular skeleton.
Bone tissue is constantly being remodeled through the processes of resorption and formation by osteoclasts and osteoblasts.
Bone marrow found within bones is responsible for producing blood cells (hematopoiesis).
Vertebrate bones can be classified based on their shape into long bones, short bones, flat bones, and irregular bones.