A manifestation of local blood flow regulation.
It is all connected as current takes place moisture changes
If your metabolism is "high" (or fast), you will burn more calories at rest and during activity. ... A person with a "low" (or slow) metabolism will burn fewer calories at rest and during activity and therefore has to eat less to avoid becoming overweight.
(Assuming that this is about chromosomes)
A male has an XY combination in his chromosomes.
