What is lumbar vertebrae bigger and stronger than cervical vertabrae?

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What is lumbar vertebrae bigger and stronger than cervical vertabrae?

1) What is lumbar vertebrae bigger and stronger than cervical vertabrae?? Also what would be the differences in vertebraes of an athlete and a person who never exercises??

2) What are all hormones involved in regulation of blood calcium level?? How is this also a negative feed back???

 

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