During adolescence, there’s a greater vulnerability to stress o “feedback loop” – hypothalamus monitors levels of androgens and estrogens in bloodstream. When levels go below a certain point, it ramps up production and when rises above a certain point it stops production. o Set point: (like a thermostat) the set point is higher at onset of puberty, which allows for more sex hormones in bloodstream Physical Changes Physical growth Primary sex characteristics Secondary sex characteristics Adolescent growth spurt o Pituitary gland stimulates thyroid to begin producing thyroxine Thyroxine: stimulates growth o Girls hit growth spurt two years early than boys
o Boys grow faster during spurt Puberty is second fastest rate of growth during lifespan o Fastest is infancy- 2 years Asynchronicity: uneven growth in body parts during puberty Sex Differences and Body Composition Fat to muscle ration for girls 5:4 and boys 3:1 Waist to hip ratio is also different, girls having larger hips in relation to their waste than boys Primary Sex Characteristics Changes that directly facilitate reproduction Growth and changes that allow egg and sperm production Secondary Sex Characteristics Changes that are NOT directly related to reproduction Breast growth, body hair growth, and skin changes Vocal changes (mainly in boys)
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- Winter '15
- Luteinizing hormone, FSH