The Role of Hormones in Biological Sex
Psychology: AQA A Level, topic 10.1.2
Effects of Hormones in Biological Sex
Testosterone, oestrogen, and oxytocin influence biological sex development, physical traits, and some sex-typical behaviours.
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 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 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
- 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
- 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
- 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
- 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
- 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.
Test yourself on The Role of Hormones in Biological Sex
What is the main role of oxytocin in the body?
Which of the following is NOT true?
Features of Rimmele et al.