Bone is living tissue that makes up the body's skeleton. Bone is a connective tissue largely composed of an organic protein; collagen and the inorganic mineral hydroxyapatite. Bones are rigid organs that form part of the endoskeleton of vertebrates. Bones function to move, support, and protect the body, produce red and white blood cells and store minerals. Bones come in a variety of shapes and have a complex internal and external structure, allowing them to be lightweight yet strong and hard, while fulfilling their many other functions. One of the types of tissues that makes up bones is the mineralized osseous tissue. Minraliss bones also drew the bone, which gives the bones of their rigidity and honeycomb-type three-dimensional internal structure. Other types of tissue in the bone marrow particular, the periosteum, nerves, blood vessels and cartilage. The main bone tissue, bone tissue is relatively hard and lightweight composite material, formed mainly of calcium phosphate in the arrangement chemical called calcium hydroxylapatite (bone tissue that gives the bones of their rigidity ). It is relatively high, but compressive strength poor tensile strength, meaning it resists forces grow well, but not the thrust levels. There are five types of bones in the human body long, short, flat, irregular and sesamoid. Long Bones are longer than wide, they are composed of a long handle (the diaphysis) plus two articular (joint) surface, called epiphyses. They are comprised mostly of bone, but are generally thick enough to hold considerable and spongy bone marrow hollow in the center (the medullary cavity). Short bones are roughly cube-shaped, and have only a thin layer of compact bone surrounding a spongy interior. Flat bones are thin and generally curved, with two parallel layers of compact bones sandwiching a layer of spongy bone. Flat bones are thin and generally curved, with two parallel layers of compact bones sandwiching a layer of spongy bone. Most of the bones of the skull are flat bones, as is the sternum. Irregular bones do not fit into the above categories. They consist of thin layers of compact bone surrounding a spongy interior. As implied by the name, their shapes are irregular and complicated. The bones of the spine and hips are irregular bones. Sesamoid bones are bones embedded in tendons. Since they act to hold the tendon further away from the joint, the angle of the tendon is increased and thus the force of the muscle is increased.
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