Most hormones' secretions are regulated by feedback, whereby a hormone's secretions are regulated by the hormone itself; in contrast, feedback occurs when a hormone is stimulated by a tropic hormone to secrete more of their own hormone as well as the tropic hormone.

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the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy