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Bodily Rhythms. Endogenous pacemakers The internal ‘body clocks’ that generate biological rhythms Exogenous zeitgebers External factors that regulate or alter biological rhythms. www.psychlotron.org.uk. Hypothalamus. GnRH. Pituitary Gland. FSH & LH. The Menstrual Cycle. Ovaries & Uterus.
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Bodily Rhythms • Endogenous pacemakers • The internal ‘body clocks’ that generate biological rhythms • Exogenous zeitgebers • External factors that regulate or alter biological rhythms www.psychlotron.org.uk
Hypothalamus GnRH Pituitary Gland FSH & LH The Menstrual Cycle Ovaries & Uterus www.psychlotron.org.uk
LH Hormone Levels FSH ovulation The Menstrual Cycle www.psychlotron.org.uk
No birth control Sexual Activity Birth control ovulation The Menstrual Cycle www.psychlotron.org.uk Adams et al (1979)
The Menstrual Cycle • Generated by the hypothalamus • Fluctuations in hormone levels affect: • Internal biology (ovulation, menstruation) • Sexual behaviour (optimal for conception) • Apparently influenced by zeitgebers • Possible pheromonal mechanism • Possible evolutionary advantage www.psychlotron.org.uk