11.2.2

The Role of Hormones in Biological Sex

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Effects of Hormones in Biological Sex

Testosterone, oestrogen, and oxytocin influence biological sex development, physical traits, and some sex-typical behaviours.

Hormones

Hormones

  • Hormones are chemicals secreted by glands that regulate development and body functions.
  • Sex hormones influence the development of biological sex characteristics and some aspects of behaviour.
Testosterone

Testosterone

  • Testosterone is one of the key sex hormones.
  • Testosterone is a type of androgen.
  • Characteristics of testosterone include:
    • Higher levels in males.
    • Responsible for male physical characteristics such as muscle growth, facial/body hair, and development of male genitalia
Oestrogen and oxytocin

Oestrogen and oxytocin

  • Oestrogen is another key sex hormone.
  • Characteristics of oestrogen include:
    • Higher levels in females.
    • Responsible for female physical characteristics such as breast development, menstruation, and regulation of reproductive organs.
  • Oxytocin is a hormone involved in social bonding and reproductive processes in both sexes.
Hormone production

Hormone production

  • Both sexes produce testosterone and oestrogen, but in different quantities.
  • Differences in the production of these hormones, as well as oxytocin, can have effects on the biological sex development.
Biological effects

Biological effects

  • Testosterone and oestrogen influence physical development and some sex-typical behaviours.
  • Studying hormonal effects helps explain how biological sex develops and the diversity of physical sex characteristics.

Oxytocin

Oxytocin, produced in both sexes, supports social recognition, bonding, and attachment; oestrogen may enhance its effects in females

Production

Production

  • Oxytocin is a hormone produced in both males and females.
  • Oxytocin plays a role in social cognition, bonding, and attachment.
  • Oestrogen may enhance oxytocin’s effects, particularly in females.
Biological effects

Biological effects

  • Oxytocin improves recognition of unfamiliar faces and supports social interaction.
  • In females, oxytocin is released during labour and breastfeeding, facilitating nurturing behaviours.
  • In both sexes, oxytocin contributes to attachment and social bonding.
Research evidence

Research evidence

  • A study conducted in 2009 by Rimmele et al. discovered that higher levels of oxytocin in males improved their ability to recognise other people’s faces.
    • They did not know the faces beforehand.
    • Their ability to recognise objects and other non-social images did not improve.
  • Studying oxytocin helps understand how sex hormones influence the brain and sex-typical behaviours.
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