Skeletal-System-Spring-2009

Skeletal-System-Spring-2009 - TheSkeletalSystem: Chapters79

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Click to edit Master subtitle style The Skeletal System: Chapters 7 – 9
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Anatomy of a Bone there are 206 bones in the adult human skeleton with 270 at birth (decreasing with the fusion of bones as one ages) these bones are composed of osseous tissue (bone tissue) they are organs with their own system of blood vessels, lymphatic vessels, and nerves
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Cells of Osseous Tissue osteoblasts mineralize organic matter of matrix; a bone-forming cell osteocytes are osteoblasts trapped in the matrix they formed ( a bone cell ) cells in lacunae connected by gap junctions inside canaliculi (page 217 in your text)
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Cells of Osseous Tissue osteoclasts develop in bone marrow by fusion ( a bone-absorbing cell that removes old bone cells) resides in pits in which they “ate” into the bone
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the primary organs of the skeletal system (bones) lie buried within the muscles, and other soft tissues, providing a rigid framework and support structure for the entire body in this respect, the skeletal system functions like steel girders in a building however unlike steel girders, bones can be moved as well as remodeled in order to help the body respond to an ever changing environment
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this ability of bones to change allows our bodies to grow and adapt to new situations an understanding of how bones articulate (move) with one another in joints, and how they relate to other body structures, provides a basis for understanding the functions of many other organ systems coordinated movement , for example, is possible only because of the way bones are joined to one another and because of the way muscles are attached to these bones in addition, knowing where specific bones are within the body will assist you in locating other body structures (i.e. spleen)
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bone structure provides: a. support b. protection c. movement d. electrolyte balance e. acid-base balance f. blood cell formation g. mineral storage h. a system of levers upon which muscles act to produce body movements (page 214 in your text)
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Functions of the Skeletal the skeletal system gives form and shape to the body as previously discussed without the skeletal components, we would appear as big “blobs” inefficiently “oozing” around on the ground besides contributing to shape and form, our bones perform several other functions as well as play an important role in homeostasis
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the intercellular matrix of bone contains large amounts of calcium salts, the most important being calcium phosphate overall, calcium is necessary for vital metabolic processes for example, when blood calcium levels decrease below normal (the set point), calcium is released from the bones so that there will be an adequate supply for metabolic needs (catabolism or anabolism) when blood calcium levels are increased, the excess calcium is stored in the bone matrix storage and release are dynamic processes that go on
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bones also provides support for the body against the pull of gravity
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Skeletal-System-Spring-2009 - TheSkeletalSystem: Chapters79

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