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: During [[ejaculation]] the [[sperm|sperm cells]] leave the [[testes]] via the [[Sperm Duct|sperm duct]].
===About the Testes in the as Endocrine SystemGlands===: The [[testes]] are [[Endocrine Glands|endocrine glandssecrete]] which produce a [[hormone]] called [[testosterone]].: [[Testosterone]] causes the expression of male characteristics during [[puberty]] including [[muscle]] growth, growth of facial hair and the deepening of the voice.