Question

what is the characteristics features of a mammalian bone

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Answer 1

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Skeleton

The mammalian skeletal system shows a number of advances over that of lower vertebrates. The mode of ossification (bone formation) of the long bones is characteristic. In lower vertebrates each long bone has a single centre of ossification (the diaphysis), and replacement of cartilage by bone proceeds from the centre toward the ends, which may remain cartilaginous, even in adults. In mammals secondary centres of ossification (the epiphyses) develop at the ends of the bones. Growth of bones occurs in zones of cartilage between diaphysis and epiphyses. Mammalian skeletal growth is termed determinate, for once the actively growing zone of cartilage has been obliterated, growth in length ceases. As in all bony vertebrates, of course, there is continual renewal of bone throughout life. The advantage of epiphyseal ossification lies in the fact that the bones have strong articular (joint-related) surfaces before the skeleton is mature. In general, the skeleton of the adult mammal has less structural cartilage than does that of a reptile.

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Answer 2

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