PSYC-1105EL Chapter Notes - Chapter 10.3: Social Intuitionism, Non-Penetrative Sex, Jonathan Haidt
22 Jan 2017
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Document Summary
Puberty begins at approximately age 11 in girls and age 13 in boys, although there is a wide range. Physical growth is stimulated by the pituitary gland. The hypothalamus begins stimulating the release of hormones such as testosterone and estrogen, which contribute to the development of primary and secondary sex traits in boys and girls. Primary sex traits are changes in the body that are part of reproduction (e. g. enlargement of the genitals, ability to ejaculate, the onset of menstruation) Secondary sex traits are changes in the body that are not part of reproduction, such as the growth of pubic hair, increased breast size in females, and increased muscle mass in males. Menarche: the onset of menstruation typically occurs around age 12. The timing of menarche is influenced by physiological and environmental factors, such as nutrition, genetics, physical activity levels, and illness. Spermarche the first ejaculation of sperm for boys typically occurring at around age 14.
