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18 Cards in this Set

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skeletal system
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)
5 Functions of the Skeletal System
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
Delicate internal organs
a)brain protected by the cranial cavity
b)spinal cord protected by the spinal cavity
c)heart and lungs protected by the thoracic cavity
bone
1)microscopic structure
2)composed mainly of calcified matrix
lamella
concentric cylindrical layer of calcified matrix
haversian system
a single haversian canal and all the surrounding lamellae
haversian canal
space in the center of the haversian system that contains a blood vessel
lacuna
microscopic space between lamellae; containing osteocyte (bone cells)
canaliculus
microscopic canals through the lamellae; these canals form routes by which blood reaches the osteocyte
F- transport blood to osteocyte
compact bone
composed of haversian systems packed close together
spongy bone (cancellous bone)
composed of bars of calcified matrix with spaces in between
trabecula
a single bar of calcified matrix found in spongy bone
cartilage
microscopic structure
cartilage is similar to the bone except for the following exceptions
A.cartilage has a firm gel matrix
B.carilage has no canal system or blood vessels; receives blood by diffusion from nearby blood vessels.
hemopoietic tissue
a blood cell forming tissue; a form of connective tissue
Two types of hemopoietic tissue
1)bone marrow
2)lymphatic tissue
bone marrow
forms red blood cells, white blood cells, and platelets; found in bones
lymphatic tissue
forms white blood cells and some red blood cells; found in lymph nodes, spleen, and tonsils