Bones are rigi organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals. Because bones come in a variety of shapes and have a complex internal and external structure, they are lightweight, yet strong and hard, in addition to fulfilling their many other functions. One of the types of tissues that makes up bone is the mineralized osseous tissue, also called bone tissue, that gives it rigidity and honeycomb-like three-dimensional internal structure. Other types of tissue found in bones include marrow, endosteum and periosteum, nerves, blood vessels and cartilage. There are 206 bones in the adult body and about 300 bones in the infant body.

Trivia about bone

  • A big broken one of these may be stabilized by an intramedullary rod
  • Africa's Blombos Cave, occupied 90,000 years ago, has some of the earliest known tools of this animal substance
  • "Into the mouth of a bad dog often falls a good" one of these
  • Periosteum, a membrane that covers the surface of this, is from the Greek for "around" this
  • Your messy room at home might be one of these "of contention" with your parents
  • Osteo-
  • The scaly armor that surrounds the armadillo is composed of plates made of this; it's formed by ossification
  • Ossification, the formation of this, begins in the embryo at the end of the second month
  • The Gila monster is as tough as it sounds; each scale has an osteoderm, a tiny one of these for armoring