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When blood calcium levels begin to drop below homeostatic levels, ______ is released, causing calcium to be released from bones.
Disuse of such as that caused by paralysis or sever lack of exercise results in muscle and bone ____.
Our astronauts must do isometric exercises when in space because atrophy under conditions of weightlessness or lack of ____.
vertebral column; sternum
All ribs articulate posteriorly with the ____, and most connect anteriorly to the ___, either directly or indirectly.
The resilient substance that keeps bone ends from crushing when compressed is ___.
Age-related erosion of articular cartilages and formation of painful bony spurs are characteristics of ____.
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