Bone

Bone is a type of hard endoskeletal connective tissue found in many vertebrate animals. Bones support body structures, protect internal organs, and (in conjunction with muscles) facilitate movement; are also involved with cell formation, calcium metabolism, and mineral storage. The bones of an animal are, collectively, known as the skeleton. Bone has a different composition than cartilage, and both are derived from mesoderm. In common parlance, cartilage can also be called "bone", certainly when referring to animals that only have cartilage as hard connective tissue, such as cartilaginous fish (Chondrichthyes) like sharks. True bone is present in bony fish (Osteichthyes) and all tetrapods.

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There are several evolutionary alternatives to bone. These evolutionary solutions are not completely functionally analogous to bone.

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• Exoskeletal protection is offered by shells, carapaces (consisting of calcium compounds or silica) and chitinous exoskelotons.
• A true endoskeleton (that is, protective tissue derived from mesoderm) is also present in Echinoderms. Porifera (sponges) possess simple endoskeletons that consist of calcareous or siliceous spicules and a spongin fiber network.

Bones and skeletons are studied in osteology. Bones can be prepared for study by several methods, such as maceration.

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Bone: Functions ►



 

Hard: Hard: see hardness.Hard is a town in Austria.Hard is a level of difficulty...

Connective tissue: Connective tissue is any type of biological tissue with an extensive extracellular matrix and often serves to support, bind together, and protect organs. There are four basic types:...

Animal: :For the Muppet Show character, see Animal (Muppet). For the professional wrestler, see Joseph Laurinaitis....




Bone related Images and Photos (experimental)

Bone Head	Bone Doctor	Bone Bike Poster	Monkey Bone
Back Bone c.1997	Dog Bone Stamp	Bone Chillers Ice Tray	The Bone Collector
Slayer - Bone Shield	The Bone Collector DVD (Widescreen)	Bone 2011 Wall Calendar	The Bone Player 1856