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Changes during puberty

Puberty happens to every young person some time after the age of 8. It is the transition into woman/manhood when the sex organs growand develop and the body becomes ready and able to reproduce. These changes can make you feel proud and happy, and they can also make you feel confused orembarrassed.

  • Your height, weight, and muscles develop
  • Your sex organs grow
  • You become fertile
  • The glands in your skin become more active and can give you spots
  • Your sweat glands develop
  • Hair starts to grow under your arms and around your genitals
  • You may experience rapid mood swings
  • You may begin to be attracted towards members of the opposite or same sex

Changes that affect girls:

  • Your breasts develop and may feel painful as they grow
  • Your nipples begin to stand out
  • Your hips get rounder
  • Your ovaries start to produce ova or egg cells
  • Later in puberty, menstruation starts

Changes that affect boys:

  • Your chest and shoulders develop
  • Your voice deepens
  • Hairs start growing on your face and may grow on your chest
  • Your penis and testicles grow larger
  • Your testicles drop into the scrotum and start to produce sperm
  • You may have erections without warning
  • You will experience your first ejaculation when liquid called semen comes out of your penis (this can also happen when you are asleep.)

The a-b-c approach

Abstaining from sexual activity, faithfulness, and condom use are three behaviors that can prevent or reduce the likelihood ofsexual transmission of HIV infection. These behaviors are often considered together as the "ABCs" of HIV prevention - A for abstinence (or delayed sexual initiation among youth), B for being faithful (or reducing one's number of sexual partners), and C for condom use, especially for casual sexual activity and other high-risk situations.

Understanding and promoting these behaviors are key elements in combating the spread of HIV/AIDS. Based on a growing body ofevidence from a number of developing countries, USAID supports the ABC approach because it can target and balance A, B, and C interventionsaccording to the needs of different at-risk populations and the specific circumstances of a particular country confronting the epidemic.

Background: The Decline of HIV Prevalence in Uganda

As one of the world's earliest success stories in confronting AIDS - and probably the most dramatic - Uganda experiencedsubstantial declines in HIV prevalence during the 1990s. According to estimates by the U.S. Census Bureau and UNAIDS, national prevalence peakedat around 15 percent in 1991 and fell to 5 percent by 2001. Among pregnant women in urban areas, prevalence declined from a high of approximately 30percent to about 10 percent, while among rural pregnant women it fell from more than 10 to less than 5 percent. Uganda's vivid decline in HIV prevalenceremains unique worldwide. In other sub-Saharan African countries with epidemics of comparable severity and longevity, similar declines have yetto occur. Accordingly, Uganda's success has been the subject of intense study and analysis.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Hiv-aids for educators. OpenStax CNX. Mar 07, 2006 Download for free at http://cnx.org/content/col10329/1.6
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