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Ch. 6 Histology
Question | Answer |
---|---|
produce new bone matrix | osteoblasts |
mature bone cells | osteocytes |
mesenchymal cells present in small numbers in the inner, cellular layer of the peritoseum | osteoprogenitor cells |
cells that remoce and recycle boneimatrix | osteoclasts |
struts and plates in spongy bone | trabeculae |
osteoprogenitor cells in the inner later of the periosteum differentiate into osteoblasts and add bone matrix to the surface | appositional growth |
fibrous outer layer and a cellular inner layer. isolates the bone from surrounding tissues, provides a route for the blood and nervous supply, actively participates in bone growth and repair. | periosteum |
incomplete cellular layer that lines the medullary cavity | endosteum |
when mesenchymal cells differentiate into osteoblasts within embryonic or fibrous connective tissue | intramembranous ossification |
inadequate production of growth hormone leads to reduced epiphyseal cartilage activity and abnormally short bones | pituitary growth failure |
epiphyseal cartilages of the long bones grow unusually slower and are replaced by bone early in life | achondroplasia |
very tall and have long, slender limbs, due to excessive cartilage formation | Marfan syndrome |
rare single gene disorder that involves the deposition of bone around skeletal muscles | fibrodysplasia ossificans progressivs FOP |
bones that develop in unusual places | heterotopic (place) or ectopic (outside) bones |
hormone that increases blood calcium levels | parathyroid hormone PTH |
hormone that decreases calcium ion concentration in body fluids through two different mechanisms | thyroid gland |
large blood clot | fracture hematoma |