PSYA02H3 Chapter Notes - Chapter 10.3: Synaptic Pruning, Pubic Hair, Spermarche
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PSYA02H3 Full Course Notes
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Puberty begins at the age of 11 for girls and 13 for guys. Physical growth is stimulated by the pituitary glands. Hypothalamus begins stimulating the release of hormones such as testosterone and estrogen. Primary sex traits changes in the body that are part of reproduction. E. g. enlargement of the genitals, ability to ejaculate, menstruation. Secondary sex traits changes in the body that are not part of reproduction. E. g. growth of pubic hair, increase breast size in females, increase muscle mass in males. Spermarche influenced by physiological and environmental factor. E. g. nutrition, genetics, physical activity levels, illness first ejaculation of sperm, at around age 14. Puberty happens much earlier than 100 years ago in the 19th century teens would reach puberty at 16-17. This is probably because of behavioural changes that increase body fat. (e. g. , poor nutrition, insufficient exercise), and increased environmental stresses that increase stress hormones in the body. As the environment changes, our biology changes along with it.
