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"NASA Technical Reports Server (NTRS) 19900017138: Effects Of Microgravity On Rat Bone, Cartlage And Connective Tissues" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19900017138: Effects Of Microgravity On Rat Bone, Cartlage And Connective Tissues” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19900017138: Effects Of Microgravity On Rat Bone, Cartlage And Connective Tissues
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19900017138

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"NASA Technical Reports Server (NTRS) 19900017138: Effects Of Microgravity On Rat Bone, Cartlage And Connective Tissues" Description:

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The response to hypogravity by the skeletal system was originally thought to be the result of a reduction in weight bearing. Thus a reduced rate of new bone formation in the weight-bearing bones was accepted, when found, as an obvious result of hypogravity. However, data on non-weight-bearing tissues have begun to show that other physiological changes can be expected to occur to animals during spaceflight. This overview of the Cosmos 1887 data discusses these results as they pertain to individual bones or tissues because the response seems to depend on the architecture and metabolism of each tissue under study. Various effects were seen in different tissues from the rats flown on Cosmos 1887. The femur showed a reduced bone mineral content but only in the central region of the diaphysis. This same region in the tibia showed changes in the vascularity of bone as well as some osteocytic cell death. The humerus demonstrated reduced morphometric characteristics plus a decrease in mechanical stiffness. Bone mineral crystals did not mature normally as a result of flight, suggesting a defect in the matrix mineralization process. Note that these changes relate directly to the matrix portion of the bone or some function of bone which slowly responds to changes in the environment. However, most cellular functions of bone are rapid responders. The stimulation of osteoblast precursor cells, the osteoblast function in collagen synthesis, a change in the proliferation rate of cells in the epiphyseal growth plate, the synthesis and secretion of osteocalcin, and the movement of water into or out of tissues, are all processes which respond to environmental change. These rapidly responding events produced results from Cosmos 1887 which were frequently quite different from previous space flight data.

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