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Arousal - Sex Hormones Hormones are powerful chemical...

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Attraction and Mate Selection Sexual Arousal and Rhythms
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Sexual Arousal and Rhythms  Sex Hormones: Hormones are powerful chemical substances manufactured by the endocrine glands and secreted directly into the bloodstream. Most important sex hormones: Testosterone Estrogen Progesterone
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Sexual Arousal and Rhythms Male: Testosterone - Masculinizing sex hormone. Follicle-stimulating hormone (FSH) Controls sperm production. Luteinizing hormone (LH) Controls testosterone production. Gonadotropin-releasing hormone (GnRH) Regulates the pituitary’s secretion of gonad-stimulating hormones.
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Sexual Arousal and Rhythms
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Sexual Arousal and Rhythms Female: Estrogen – Brings about many of the changes of puberty. Progesterone Prolactin – Stimulate secretion of milk by the mammary glands. Oxytocin – Stimulates contractions of the uterus during childbirth.
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Sexual Arousal and Rhythms
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Sexual Arousal and Rhythms  Prenatal Sexual Differentiation: Sex chromosomes - Transmit information to various organs on how to differentiate in the course of development. XX = female XY = male
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Sexual Arousal and Rhythms  Prenatal Development of Gonads: In the 7th week after conception, sex chromosomes direct gonads to begin differentiation. Male - undifferentiated gonad develops into a testis at about 7 weeks. Female - ovaries develop at around 10-11 wks. If SRY (sex-determining region, Y chromosone) is present, then testes differentiate and male development occurs.
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Sexual Arousal and Rhythms  Prenatal Hormones and the Genitals: In the female,
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