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Transcript
Handout Master 11-2 1. False. Physical growth and development show large differences individually can culturally, but the differences typically disappear over time. 2. True. Infants have reached half of their adult height by age 2. If the continued to grow throughout their life as quickly as they do in the first two years, they would end up more than 12 feet tall. 3. True. The average infant has many more neurons and neural connections than we do, but about half of the neurons produced early in life die. The neurons that survive form hundreds of synapses. Handout Master 11-2 4. True. A 6-month-old is simply not ready, physically, to walk, because bones and muscles must continue to develop. There is some evidence that babies, given a chance to practice their walking reflex, will walk at an earlier age-but not as young as 6 months. 5. False. A thyroid deficiency leads to low levels of thyroxin, which can cause very slow growth. Also, the pituitary produces a growth hormone that stimulates the growth and development of cells. Children who do not receive enough growth hormone typically grow to only about 4 feet tall. Injections of growth hormone are available, but are quite expensive. 6. True. Healthy children who experience too much stress and too little affection fall behind their peers in physical growth and motor development, a phenomenon known as “failure to thrive.” It appears that emotional trauma may inhibit the production of pituitary growth hormone.