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18 Cards in this Set
- Front
- Back
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skeletal system
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1)includes all the bones of the body plus joints
2)connective tissue 3)bone, cartilage, and hempoietic tissue (forms blood cells ex. bone marrow) |
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5 Functions of the Skeletal System
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1)supporting framework
2)protects delicate internal organs 3)serves as an attachment for muscles 4)hemopoiesis-process of forming blood cells; it accomplishes this goal because it contains red bone marrow and the hempoietic tissue produces blood cells 5)reservoir for minerals-supplying calcium and phosphorus to the bloodstream when needed ex. when you break a bone |
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Delicate internal organs
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a)brain protected by the cranial cavity
b)spinal cord protected by the spinal cavity c)heart and lungs protected by the thoracic cavity |
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bone
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1)microscopic structure
2)composed mainly of calcified matrix |
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lamella
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concentric cylindrical layer of calcified matrix
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haversian system
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a single haversian canal and all the surrounding lamellae
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haversian canal
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space in the center of the haversian system that contains a blood vessel
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lacuna
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microscopic space between lamellae; containing osteocyte (bone cells)
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canaliculus
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microscopic canals through the lamellae; these canals form routes by which blood reaches the osteocyte
F- transport blood to osteocyte |
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compact bone
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composed of haversian systems packed close together
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spongy bone (cancellous bone)
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composed of bars of calcified matrix with spaces in between
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trabecula
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a single bar of calcified matrix found in spongy bone
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cartilage
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microscopic structure
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cartilage is similar to the bone except for the following exceptions
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A.cartilage has a firm gel matrix
B.carilage has no canal system or blood vessels; receives blood by diffusion from nearby blood vessels. |
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hemopoietic tissue
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a blood cell forming tissue; a form of connective tissue
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Two types of hemopoietic tissue
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1)bone marrow
2)lymphatic tissue |
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bone marrow
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forms red blood cells, white blood cells, and platelets; found in bones
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lymphatic tissue
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forms white blood cells and some red blood cells; found in lymph nodes, spleen, and tonsils
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