http://www.epub.org.br/cm/n03/mente/hormones_i.htm
A hormone is a chemical substance of an endocrine gland. Endocrine glands, which are also called ductless glans, deposites the hormones into the blood stream. The blood, on its turn, carries the hormones to every part of the body.
The sex hormones are estrogen and testosterone. Like all hormones, they are chemical messengers, substances produced in one part of the body that go on to tell other parts what to do. Both women and men produce both estrogen and testosterone, though in different quantities, and both sexes produce less as they age. These hormones seems to affect arousability by altering the threshold for erotic stimulation.
They act:
centrally - by determining the amount of change in arousal produced by a given stimulus;
peripherally - by determining the amount of receptor response to a stimulus.
In most animal species the brain controls and regulates sexual behavior primarily by means of hormones. Man and other primates are exceptions to this role because he depends on personal experience and cultural aspects than its does on hormones. However, hormones seems to affect arousability by altering the threshold for erotic stimulation, regardless of weather the threshold in question is one of peripheral tissue sensitivity.
I have read that the testosterone of a newly born baby boy is the same as 17 year old male.
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This would be the forum for the subjects of
estrogen and
testosterone and how the brain reacts to these drugs.