Bones are rigid organs that constitute part of the endoskeleton of vertebrates. They support and protect the various organs of the body, produce red and white blood cells and store minerals. Bone tissue is a type of dense connective tissue. Bones come in a variety of shapes and have a complex internal and external structure, are lightweight yet strong and hard, and serve multiple functions. One of the types of tissue that makes up bone is the mineralized osseous tissue, also called bone tissue, that gives it rigidity and a coral-like three-dimensional internal structure. Other types of tissue found in bones include marrow, endosteum, periosteum, nerves, blood vessels and cartilage. At birth, there are over 270 bones in an infant human's body, but many of these fuse together as the child grows, leaving a total of 206 separate bones in an adult. The largest bone in the human body is the femur and the smallest bones are auditory ossicles.
Read more about Bone: Mechanical Properties, Cellular Structure, Types, Formation, Remodeling, Paracrine Cell Signalling, Disorders, Osteology, Alternatives To Bony Endoskeletons, Exposed Bone, Uses, Terminology
Famous quotes containing the word bone:
“Fowls in the frith,
Fishes in the flood,
And I must wax wod:
Much sorrow I walk with
For best of bone and blood.”
—Unknown. Fowls in the Frith. . .
Oxford Book of Short Poems, The. P. J. Kavanagh and James Michie, eds. Oxford University Press.
“The wealth and prosperity of the country are only the comeliness of the body, the fullness of the flesh and fat; but the spirit is independent of them; it requires only muscle, bone and nerve for the true exercise of its functions. We cannot lose our liberty, because we cannot cease to think.”
—Humphry, Sir Davy (17781829)
“People who love soft methods and hate iniquity forget this,that reform consists in taking a bone from a dog. Philosophy will not do it.”
—John Jay Chapman (18621933)