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WITH ANSWERS |\
What 3 hormonal axes are attributed to most physical changes in
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adolescents? - CORRECT ANSWERS ✔✔1) Hypothalamic-pituitary-
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gonadal (HPG) axis |\ |\ |\
2) Hypothalamic-pituitary-adrenal axis (HPA)
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3) Growth hormone (GH) axis
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What hormones are attributed to Hypothalamic-pituitary-
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GONADAL (HPG) axis? - CORRECT ANSWERS ✔✔1. Gonadotropin-
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releasing hormone (GnRH), also called luteinizing hormone-
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releasing hormone (LHRH) |\ |\ |\
2. Luteinizing hormone (LH)
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3. Follicle stimulating hormone (FSH)
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4. Estrogen
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5. Testosterone
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What hormones are attributed to Hypothalamic-pituitary-
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ADRENAL axis (HPA)? - CORRECT ANSWERS ✔✔1.
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Adrenocorticotropic hormone |\ |\
2. Dehydroepiandrosterone (ACTH)
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3. DHEA sulfate (DHEA-S)
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,What hormones are attributed to Growth hormone (GH)?axis -
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CORRECT ANSWERS ✔✔1. Growth hormone-releasing hormone
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(GHRH) |\
2. Growth hormone (GH)
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3. Insulin-like growth factors (IGFs)
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What is thought to be three distinct changes in the hypothalamic-
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pituitary unit that may trigger puberty? - CORRECT ANSWERS
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✔✔three distinct changes in the hypothalamic-pituitary unit:
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(1) a nocturnal sleep-related augmentation of pulsatile LH
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secretion; |\
(2) a decrease in the sensitivity of the hypothalamus and the
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pituitary to estradiol and testosterone, so that the gonadotropins
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LH and FSH begin to increase; and
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(3) in the female, development of a positive feedback system,
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whereby critical levels of estrogen trigger a large release of
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GnRH, stimulating LH to initiate ovulation.
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What scale allows for the accurate classification of physical
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pubertal maturation - CORRECT ANSWERS ✔✔Sexual Maturity
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Rating (SMR) scale (also called the Tanner scale)
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Girls major events of puberty - CORRECT ANSWERS ✔✔1.
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Thelarche
2. Growth Spurt
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3. Menarche
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,Thelarche - CORRECT ANSWERS ✔✔Often the earliest physical |\ |\ |\ |\ |\ |\ |\ |\
sign of puberty in girls, although a minority develop pubic hair as
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the first sign. On average, breast development starts at age 10.0
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for Caucasian girls and 8.9 years for African-American girls
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Growth Spurt - CORRECT ANSWERS ✔✔Thelarche and pubarche
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(pubic hair) may both be preceded by about 1 year by the growth
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spurt; thus the growth curve is an essential tool in the evaluation
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of precocious puberty.
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Menarche - CORRECT ANSWERS ✔✔This event usually occurs |\ |\ |\ |\ |\ |\ |\ |\
during SMR B3 or B4 and about 3.3 years after the growth spurt,
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or roughly 2 years after breast budding.
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What is the average length of time for completion of puberty ? -
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CORRECT ANSWERS ✔✔4 years, but it can range from 1.5 to 8 |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
years
What is the first physical sign of puberty in the majority of boys ?
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- CORRECT ANSWERS ✔✔Testicular Growth: The first physical
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sign of puberty in the majority of boys is increased testicular
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volume, although the most noticeable first event of male puberty
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is the growth of pubic hair
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What are other signs of male puberty? - CORRECT ANSWERS
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✔✔2. Growth Spurt: Midpuberty, or the time of rising
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testosterone concentrations, is associated with the period of |\ |\ |\ |\ |\ |\ |\ |\
most rapid linear growth in boys, in contrast to the early growth
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spurt in girls. It is also at this time that the voice changes axillary
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hair appears, and possibly also acne. Facial hair growth typically
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, starts about 3 years after pubic hair growth. The hair on the face,
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chest, back, and abdomen may continue to appear throughout
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and beyond puberty into adulthood, its amount and distribution
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being quite variable and dependent on ethnicity and family
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patterns. |\
3. Attainment of Fertility: Ejaculation usually occurs at SMR G3,
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as does the first evidence of spermarche, but fertility is not
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usually attained until SMR G4. |\ |\ |\ |\
What is the average length of time for completion of puberty for
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boys? - CORRECT ANSWERS ✔✔average length of time for the
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completion of puberty is 3 years, but it can range from 2 to 5 |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
years. |\
Genital development is initiated at about 10.1 years for white
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boys, 9.5 years for African-American boys, and 10.4 years for
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Mexican-American boys, with completion of puberty at 15.9 years |\ |\ |\ |\ |\ |\ |\ |\
in white boys, 15.7 years in African-American boys, and 14.9
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years in Mexican-American boys.
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Gonadal Steroids - CORRECT ANSWERS ✔✔The target tissues of
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LH and FSH are the ovaries and testes, which produce estradiol
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and testosterone, respectively. Testicular Leydig cells also
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produce androstenedione, dihydrotestosterone, and estradiol, but
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to a much lesser extent.
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Estrogen. - CORRECT ANSWERS ✔✔Estradiol from the ovary |\ |\ |\ |\ |\ |\ |\ |\
accounts for the majority of the circulating estrogens, although
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there is a small amount of extraovarian conversion from
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androstenedione and testosterone. In addition to stimulating |\ |\ |\ |\ |\ |\ |\
breast growth and maturation of the vaginal mucosa, estrogen
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