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
honeycomb-like three-dimensional internal structure. Other types of tissue found in bones include
marrow,
endosteum and
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.
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![Venus Comb Murex in Suma Aqualife Park. In Japanese it called "bone shell".](http://opencage.info/pics/files/800_5454.jpg "Venus Comb Murex in Suma Aqualife Park. In Japanese it called "bone shell".")
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