Chapter 6 - Human Development

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Family Relations and Human Development
FRHD 1010
Susan Chuang

Chapter 6Human Development Bodily Growthy Ages 36 grows 23 inches per year and adds 5 to 7 pounds y Typical 3 year old is about 35 inches tall and weighs about 30 pounds the typical 6 year old is about 45 inches tall and weighs about 45 pounds y Boys are slightly taller and heavier y Both gain more muscle than fat y Lose their remaining baby fat y In developing countries heights and weights are considerably lower y Wealthier people have more access to nutritional foods so their children are taller and weigh more than poorer children of the same agegenetics does play a role though y By third birthday most children have a full set of 20 teeth y Primary or baby teeth will be replaced by 32 permanent teeth beginning about age 6 y First visit to the dentist is around 3 y Add fluoride to the water system which greatly reduces childrens rates of cavities y Developing countries have more tooth decay in early and middle childhoodBrain Development and Infantile Amnesia y At age 3 brain is about 70 of its adult weight and at age 6 90 y 6 year olds body weight is less than 30 what it will be in adulthood y The frontal lobes grow faster than the rest of the cerebral cortex during early childhood y Advances in emotional regulation foresight and organizing that take place during the preschool years y Cerebral cortex growth from age 3 to 15 takes place in spurts within the different lobes followed by periods of vigorous synaptic pruning y The increase in brain size and weight during early childhood is due to an increase in dendritic connections between neurons and to myelination Four parts of the brain are especially notable for their myelination during early childhoodCorpus Collosum band of neural fibers connecting the two hemispheres of the brain y Enhances the speed of functioning throughout the cerebral cortexCerebellum structure at the base of the brain involved in balance and motor movementsReticular Formation part of the lower brain involved in attention y Completed by age 5
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