Title : How children develop
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How children develop
how children develop
Physical growth: childhood through adolescence
early in life, males and females are very similar in size, appearance and abilities. At birth, men, on average, weigh only about half a pound more than women do; through breastfeeding, male and female babies are so similar that, if dress in gender-neutral clothing, people can not guess her sex. As expected, it is very easy to fool people by dressing, for example, a small child in costume of a girl and calling him by name for a girl. In fact, this technique "Baby X" has often been used to demonstrate the power of gender stereotypes. Adults who believe they are playing with a child is likely to encourage the baby to play with blocks and to give the baby a toy football, even though the baby is really a girl (Bell & Carver, 1980). The technique succeeds in revealing the influence of stereotypical expectations because there is no consistent or obvious differences in the female form and boys really are (when they dress in a neutral way) or how they behave.
As discussed in Chapter 3, during childhood, boys and girls grow at about the same rate and are essentially equal in height and weight, although children are noticeably stronger. With changes in body composition that occur in early adolescence, particularly in the substantial increase in muscle mass in children, the gap has xisted years in skills related to the sport of children increases to a large degree. After puberty, the average gender differences in strength, speed and size are very large: that is, teenagers can run fast or throw a ball so most children can (Malina and Bouchard, 1991; Thomas & French, 1985). Another average gender gap increasing in magnitude during childhood is the level of activity (Eaton and Enns, 1986). As described in Chapter 10, the level of activity is a temperamental quality that refers to the number of children tend to move and wasting energy. On average, the level of activity of men tends to be higher than that of girls. In childhood, the difference is small, which means that there is a lot of overlap between the distributions of the two sexes (see Figure 15.3). During childhood, the average gender gap in the level of activity increases medium. This increase may be the result of a combination of effects of the practice and greater encouragement was given to children to participate in sports and other physical activities (Leaper and Friedman, 2007). At the same time, the average gender differences in the level of activity may also contribute to the preferences of children for activities gendertyped game.
In adolescence, a series of dramatic physical changes associated with puberty, defined as the development of the ability to reproduce for boys, to impregnate, and for girls to menstruate, gestate and lactate. In girls, puberty typically begins with breast enlargement and acceleration of overall growth in height and weight, followed by the appearance of pubic hair and after the onset of menstruation, known as menarche. Menstruation is triggered in part by the increase in body fat that normally occurs in adolescence. In children, puberty usually begins with the growth of the testicles, followed by the appearance of pubic hair, acceleration of overall growth, penis growth, and the ability of ejaculation, known as Spermarche (Gaddis and Brooks-Gunn, 1985; Jorgensen and Keiding, 1991).
For both sexes, there is considerable variability in physical maturation. Compared with their peers Euro-Americans, for example, African-American children mature a little earlier, and the onset of puberty is a bit before African-American girls. Girls with a very low proportion of body fat, such as long-distance runners, gymnasts and dancers, often experience a delay in menarche (Brooks-Gunn, 1987) .The variability in physical development is due to genetic factors and environmental. Genes that affect growth and sexual maturation in large part to influence the production of hormones, especially growth hormone (secreted by the pituitary gland) and thyroxine (released by the thyroid gland). The influence of environmental factors is particularly evident in secular trends, or changes in physical development that have occurred for generations (see page 117). In the United States today, girls begin to menstruate several years earlier than their ancestors did 200 years ago. This change is believed to reflect an improvement in nutrition from generation to generation. The physical changes that children experience as they go through puberty are accompanied by psychological and behavioral changes. For example, in some cultures, increased body fat than girls experience during adolescence may be related to gender differences in body image, ie, how an individual perceives and feels about their physical appearance. Today, American girls tend to have more negative attitudes toward their bodies than men and adolescents generally want to lose several pounds regardless of how much you actually weigh (Tyrka, Graber, and Brooks-Gunn, 2000). A survey of more than 10,000 US adolescents found that about half of children and two thirds of girls were dissatisfied with their body. The girls were mostly concerned about weight loss; boys, with the most inflated (Field et al., 2005). Dissatisfaction with body image has long been known to be associated with a number of difficulties, ranging from low self-esteem and depression to eating disorders. This survey added another to the list :. Substance use unproven and potentially harmful to control weight or build muscle, recognized by 12% of men and 8% of girls surveyed
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Another change that accompanies physical maturation is in how girls and boys have for each children other.Although avoid each other for much of his childhood, sexual attraction begins long before the physical process of puberty is completed. According to the memories of a sample of American adults, sexual attraction is experienced for the first time in about 10 years of age, regardless of whether the attraction is for individuals of the opposite sex or the same sex (McClintock and Herdt, nineteen ninety six). The onset of sexual attraction is correlated with maturation of the adrenal glands, the main source of various sex steroids from the testes and ovaries. This stage is called adrenarche, which some researchers believe is an early stage of puberty, although the child's body still show no outward signs of maturation.
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❚ ❚ puberty development period characterized by the ability to reproduce and other dramatic body changes
❚ menarche ❚ the onset of menstruation
❚ spermarche ❚ the development of the capacity of men 'of body image ❚ perception of an individual ejaculation
❚ and feelings about their own body
❚ ❚ adrenarche the period before the appearance of visible signs of puberty, adrenal glands during whichthe mature, providing an important source of sex steroids. This period correlates with the onset of sexual attraction. For both sexes, there is considerable variability in physical maturation. .... Girls with a very low proportion of body fat, such as long-distance runners, gymnasts and dancers, often experience a delay in menarche (Brooks-Gunn, 1987). The variability in physical development is due to genetic and environmental factors. Genes that affect growth and sexual maturation in large part to influence the production of hormones, especially growth hormone (secreted by the pituitary gland) and thyroxine (released by the thyroid gland). The influence of environmental factors is particularly evident in secular trends, or changes in physical development that have occurred for generations (see page 117). In the United States today, girls begin to menstruate several years earlier than their ancestors did 200 years ago. This change is believed to reflect an improvement in nutrition from generation to generation.
Another change that accompanies physical maturation is how children feel about each other. Although children to avoid each other for much of his childhood, sexual attraction begins long before the physical process of puberty is completed. According to the memories of a sample of American adults, sexual attraction is experienced for the first time in about 10 years of age, regardless of whether the attraction is for individuals of the opposite sex or the same sex (McClintock and Herdt, nineteen ninety six). The onset of sexual attraction is correlated with maturation of the adrenal glands, the main source of various sex steroids from the testes and ovaries. This stage is called adrenarche, which some researchers believe is an early stage of puberty, although the child's body still shows no outward signs of maturation.
The onset of sexual interest has been linked to the maturation of the adrenal glands, a source of sex steroids in men and women.
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02/18/2016 23:16:15
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