PSY 2114 Lecture Notes - Lecture 9: Binge Eating, Synaptic Pruning, Secondary Sex Characteristic
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Puberty collection of physical changes that marks the onset of adolescence, such as growth of breasts or testes and the growth spurt. Increases of up to 9 kg for girls and 11. 4 kg for boys (mostly during growth spurt: substantial increases in strength (especially for boys) as muscle fibers become thicker and denser. Increases in heart and lung capacity, especially in boys. Some aspects of brain development are nearly complete in adolescence. Increase in size (95% of adult size and weight: myelination, synaptic pruning. Primary sex characteristics physical signs of maturity directly linked to the reproductive organs. Secondary sex characteristics physical signs of maturity not directly linked to reproductive organs. Spermarche first spontaneous ejaculation of sperm. Both of these occur on average at age 13. Hormonal: pituitary gland releases growth hormone and signals other glands to release hormones, early elementary school years, adrenal glands release androgens, which will produce body hair, later, ovaries release estrogen, testes release testosterone.