The first menstrual flow begins around 2 years after the onset of puberty and sets off a cycle that takes place every month until you reach menopause. Hair growth at the armpits, pubis, and legs. The major hormones that bring about these changes are estrogen, secreted by the ovaries in girls and testosterone, released by the testicles in boys.ĭevelopment of breasts is the first sign of puberty in girls. At the time of puberty, endocrine glands release hormones that lead to the development of secondary sexual characteristics, such as pubic hair, breast development in girls, and voice changes in boys. It can start between the ages of 10 and 14 in girls, and 12 and 16 in boys. The onset of puberty is determined by a number of factors including nutrition, genes, and body weight. Sperm are nourished by the secretions of the seminal vesicles and the prostate gland. The male reproductive system consists of the penis, the testes where sperm are generated and carried to the penis via the vas deferens, and the urethra, the urinary opening at the end of the penis. Externally, the vaginal opening is surrounded by two flaps of skin called the labia majora and labia minora. The reproductive system in females consists of the ovaries (where eggs are produced), fallopian tubes, uterus, and the vagina. Boys and girls undergo many physical changes at puberty, and achieve fertility due to the influence of reproductive hormones. Puberty is the stage in a child’s life that marks sexual maturity.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |