Developmental Psychology Reading Reflectoin Ch 7

845 Words4 Pages
1. The impact of heredity on physical growth is unmistakable throughout childhood. Children’s physical and rate of growth are linked to those of their parents. Genes influence growth by controlling the body’s production of hormones. The brain is responsible for all control over the body, even the production of hormones. The pituitary gland plays a significant role by releasing two hormones that encourage growth. One of the hormones that the pituitary gland produces that is involved in the child’s growth is the thyroid-stimulating hormone (TSH). This hormone cues the thyroid gland to release thyroxine (which is necessary for brain development and for other hormones to have its full impact on the body). Infants born with a deficiency of thyroxine must receive it at once or they will be mentally retarded. Once the most rapid period of the brain’s development is complete children with too little thyroxine grow at a below-average rate but the central nervous system is no longer affected. With prompt treatment, such children cat up in body growth and eventually reach normal size. The most important hormone that the pituitary gland produces is the growth hormone (GH) which is necessary for development of all body tissues except the central nervous system and the genitals. Children who lack GH reach an average mature height of only 4 feet, 4 inches. When treated early with injections of GH, such children show catch-up growth and then grow at a normal rate, becoming much taller than they would have been without the treatment. With the transition to early childhood, many children become unpredictable, picky eaters. Young children’s appetites decline because their growth has slowed (though their wariness of new food is also adaptive). If they stick to familiar foods, they are less likely to swallow dangerous substances when adults are not present. Parents don’t need to

More about Developmental Psychology Reading Reflectoin Ch 7

Open Document