infradian rhythm

• What is the role of circadian rhythm in humans?

  It regulates the sleep-wake cycle
• What does the term "circadian" mean?

  It means around the day
• What does "infradian" refer to in biological rhythms?

  Rhythms that occur less than once a day
• What does "ultradian" mean in the context of biological rhythms?

  Rhythms that occur more than once every 24 hours
• What is the most obvious infradian rhythm in humans?

  The menstrual cycle
• What is the duration of the menstrual cycle?

  28 days
• What are the biological changes during the menstrual cycle?

  Releasing the egg and thickening of womb lining
• Which hormones regulate the menstrual cycle?

  Estrogen and progesterone
• What is the role of endogenous pacemakers in the menstrual cycle?

  They keep biological processes to time
• How did McClintock's research in 1971 contribute to understanding menstrual synchronization?

  Women synchronized their cycles in dormitories
• What did Russell's 1980 research suggest about menstrual synchronization?

  It could be due to shared pheromones
• What was the method used in Stern's 1998 study on menstrual cycles?

  Women used pads from donor women's armpits
• What did Stern's study find regarding menstrual cycles?

  Cycles were influenced by donor women's cycles
• What is a criticism of the idea that pheromones influence menstrual synchronization?

  Many studies failed to replicate findings
• What did Trevathan's 1993 study reveal about menstrual synchronization?

  Lesbian couples did not synchronize cycles
• What evolutionary advantage is proposed for synchronized menstrual cycles?

  It prevents one male from dominating reproduction
• What is a conflicting argument against synchronized menstrual cycles being adaptive?

  Women may want the best genes for offspring
• What historical belief is associated with menstrual cycles?

  They were thought to be controlled by the Moon
• What did the study of 1.5 million women reveal about menstrual cycles and the Moon?

  No link to lunar phases was found
• Why is the relationship between menstrual cycles and the Moon considered correlation, not causation?

  There is no direct influence established
• How long is the average menstrual cycle?

  Approximately 28 days
• What is the significance of the term "menstrual" in relation to the Moon?

  It derives from the Greek word for Moon
• What is the average length of the lunar cycle?

  29.5 days
• What is the relationship between menstrual cycles and evolutionary relatives like chimpanzees?

  They have longer cycles without synchronization
• What is the conclusion about menstrual cycles and evolutionary advantages?

  No evidence supports synchronization advantages
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  More than 140 videos
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