Many of the deepest questions in biology and medicine originate in the processes of growth and development, which are unimaginably intriguing whether considered in terms of complexity, mechanism, or scale. Set aside the question of how the microscopic germ line has been passed along intact over a period of billions of years, yet somehow unfolds to produce creatures that are individually mortal and dispensable. In terms of scale, the human begins with a fertilized ovum weighing a fraction of a milligram, and may attain adulthood at weights of 50–100 kg. My own 15-year-old son, still in his growth years, weighs 113 kg. That represents an increase in mass from conception of much more than one million-fold! It is daunting to consider that we as parents must purchase the groceries to support mass increases on this scale!
Specific Growth Rate Hepatocyte Growth Factor Human Growth Gompertz Function Decline Growth Rate
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