8/8/2019 Brain's Puberty Switch -- Neuroendocrinologists Unlock Chemical Trigger to P

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8/8/2019 Brain's Puberty Switch -- Neuroendocrinologists Unlock Chemical Trigger to P

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Brain's Puberty Switch -- Neuroendocrinologists Unlock Chemical Trigger to Puberty

http://www.sciencedaily.com/videos/2005/0512-brains_puberty_switch.htm[01.12.2010 13:15:12]

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Puberty is the developmental stage where a child starts tobecome sexually mature. It can occur between ages 8 and11 for girls, and 9 to 12 for boys.

As a child nears maturity, the brain -- specifically the partsknown as the hypothalamus and the pituitary gland --releases chemicals called hormones. The hormonesregulate the reproductive organs of both m ales andfemales. Girls produce estrogen and progesterone, whileboys produce testosterone. Growth hormones also begin towork, causing the body to become larger, sometimes veryquickly. The body also makes follicle stimulatinghormones, leading to hair growth.

All these extra hormones give rise to dramatic changes inthe body.

The first sign of puberty in girls is breast development.Then hair starts growing in the pubic area and armpits,followed by acne around age 13. Menstruation is typicallythe last stage to occur.

In boys, the larynx lengthens and the voice "breaks" andthen deepens. Also, there is growth in the testicles andpenis, followed by hair growth in the pubic region andarmpits. Acne and facial hair are the last developments.

Both girls and boys may also experience strong emotionsor mood changes.

Editor's Note: This article is not intended to providemedical advice, diagnosis or treatment.

Note:This story and

accompanying video wereoriginally produced for theAmerican Institute of PhysicsseriesDiscoveries andBreakthroughs in SciencebyIvanhoe Broadcast News and areprotected by copyright law. Allrights reserved.

Reproduc t ive Cyc le (July 15, 2007) The onsetof puberty and maintenance of the femalereproductive cycle are events controlled by neurons inthe hypothalamus that secrete gonadotropin-releasinghormone (GnRH). How signaling to these ... > readmore

Cou ld a P i l l Inc rease Learn ing Ab i l i t y Pos t -Puber ty?(March 19, 2010) New research showsthat a novel brain receptor, alpha4-beta-delta,emerges at puberty in the hippocampus, part of thebrain that controls learning and ... > read more

Sc ien t is ts F ind Hormone Ac t iv i ty Exp la insAdo lescen t Mood Swings (March 12, 2007) The "raging hormones" of puberty are known to

produce mood swings and stress for most teenagers,making it difficult to cope with this period of life. Untilnow, the specific causes of pubertal ... > read more

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