A bone is a rigid tissue that constitutes part of the vertebrate skeleton in animals. Bones protect the various organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body, and enable mobility. Bones come in a variety of shapes and sizes and have a complex internal and external structure. They are lightweight yet strong and hard, and serve multiple functions. 骨骼是构成动物脊椎动物骨骼的一部分的刚性组织。骨骼保护身体的各种器官，产生红细胞和白细胞，储存矿物质，为身体提供结构和支撑，并使其能够活动。骨骼有各种形状和大小，内部和外部结构复杂。它们重量轻但坚固耐用，具有多种功能。
Bone tissue (osseous tissue) is a hard tissue, a type of specialized connective tissue. It has a honeycomb-like matrix internally, which helps to give the bone rigidity. Bone tissue is made up of different types of bone cells. 骨组织（骨组织）是一种硬组织，是一种特殊的结缔组织。它内部有一个蜂窝状基质，这有助于增强骨骼的硬度。骨组织由不同类型的骨细胞组成。
Bone marrow, also known as myeloid tissue in red bone marrow, can be found in almost any bone that holds cancellous tissue. In newborns, all such bones are filled exclusively with red marrow or hematopoietic marrow, but as the child ages the hematopoietic fraction decreases in quantity and the fatty/ yellow fraction called marrow adipose tissue (MAT) increases in quantity. In adults, red marrow is mostly found in the bone marrow of the femur, the ribs, the vertebrae and pelvic bones. 骨髓，也称为红骨髓中的髓样组织，几乎可以在任何含有松质组织的骨骼中找到。在新生儿中，所有这些骨骼都只充满红骨髓或造血骨髓，但随着孩子年龄的增长，造血部分的数量减少，称为骨髓脂肪组织（MAT）的脂肪/黄色部分的数量增加。在成年人中，红骨髓主要存在于股骨、肋骨、脊椎和骨盆的骨髓中。
Bone matrix is 90 to 95% composed of elastic collagen fibers, also known as ossein, and the remainder is ground substance. The elasticity of collagen improves fracture resistance. The matrix is hardened by the binding of inorganic mineral salt, calcium phosphate, in a chemical arrangement known as calcium hydroxylapatite. It is the bone mineralization that give bones rigidity. 骨基质90%至95%由弹性胶原纤维（也称为骨胶原）组成，其余为基质。胶原蛋白的弹性提高了抗折性。基质通过无机矿物盐磷酸钙的结合而硬化，这种化学排列被称为羟基磷灰石钙。正是骨骼矿化使骨骼坚硬。
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