Puberty Onset Influencing Factors - Anatomy & Physiology

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Female Threshold Body Size

  • Nutritional intake of the newborn is directed towards body maintenance.
  • The priority of the neonate is to maintain vital physiological functions.
  • Non-essential processes, such as reproduction are of low priority.
  • As the neonate grows, energy consumption increases and the body mass increases with a relative decrease in body surface area.
  • This allows a shift in metabolic expenditure so that other physiological functions can develop.
  • The excess internal energy is converted to fat stores, and a priority is then placed on reproduction so the onset of puberty begins.
  • Fat accumulation alone does not determine the onset of puberty, but it is an important regulator.
  • All female mammals must reach a certain body size before the onset of puberty can be initiated.
  • Metabolic signals affect production of GnRH.




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