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Our bodies and brains are transformed as we grow up. The most dramatic changes happen in infancy and during the teenage years, but we continue changing throughout life.
A new born baby weights only 3 kg or so. unable to walk,feed itself,or see further than a few centimetres,it is completely dependent on its parents. by the age of 20, we weigh perhaps 20 times as much and are capable of leading independent lives. the process of development that transforms a baby into an adult is continuous, but two major growth spurts occur during childhood.
One takes place in the first six months, when a baby doubles in weight. the second is during puberty, when the release of sex hormones triggers the emergence of adult features. growing up is not just a physical process. we also grow emotionally and intellectually, our brains changing as we slowly acquire complex knowledge and social skills needed to navigate the adult world.
Growing bones....
As you grow taller and broader, your bones become longer and wider too. bones are too hard to Simply stretch in length, but they contain areas of soft tissue near the ends where new bone cells are laid down. called growth plates, these look like gaps on X-RAYS. when you reach adulthood and your bones stop growing, the growth plates fill with solid bone and disappear.
Brain development...
At birth,a baby's brain is about a quarter the size of an adult's,. but it has almost the same number of cells. The brain grows rapidly until about age 6, when it reaches 90 per cent of adult size. in early childhood, brain cells from a dense web of connections to each other, giving the brain great potential to learn new skills. later, connections that haven't been used are pruned away, and the remaining ones are strengthened.
Puberty....
Around the age of 10-14 in girls and 11-15 in boys, the body goes through a period of rapid growth and sexual development known as puberty. sex hormones are released by the testes in boy and by the ovaries in girls.
These cause many physical changes, such as growth of body hair and facial hair, development of breasts and the menstrual cycle, and changes in height and body shape. the physical changes are accompanied by emotional and behavioral changes as the brain matures- a slow process that lasts well into the 20s.
Growth spurts....
Bones grow more quickly in puberty, causing a sudden increase in height. girls reach puberty earlier than boys and overtake them in height at about age 11. boys catch up by about age 14 and reach a greater average adult height than girls.
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