Know Your Body

Male Reproductive System

The physical changes boys experience during puberty include:

  • Height and weight increase
  • Body hair grows in the pubic area, under his arms, and on his face, and becomes thicker on his legs 
  • Muscles become stronger
  • Vocal cords get thicker and longer and his voice deepens
  • Sweat and oil glands become more active and his body odor changes 
  • Acne (pimples) may develop
  • Testes, scrotum, and penis mature and become ready for reproduction, making it possible for him to get a girl pregnant


Male Reproductive System

Male Reproductive System

Interactive Male Reproductive System

Click here for a fully interactive diagram of the male reproductive system. Must have Flash player installed.


Female Reproductive System

The physical changes girls experience during puberty include:

  • Height and weight increase 
  • Body hair grows in the pubic area and under her arms 
  • Body hair on the legs and arms grows 
  • Breasts start to develop; nipples become raised and this area may be tender 
  • Waist and hip development also begins, making her body a little rounder
  • Sweat and oil glands become more active and her body odor changes 
  • Voice changes from a girl's to a women's
  • Acne (pimples) may develop 
  • Ovaries become active, causing hormone production to begin 
  • Ovulation (the monthly release of an egg) and menstruation (periods) begin, making it possible for her to get pregnant 


Female Reproductive System

Female Reproductive System

Interactive Female Reproductive System

 Click here for a fully interactive diagram of the female reproductive system. Must have Flash player installed.


Interactive Quiz for Female, Male, and Reproductive System


Want to test your knowledge of the reproductive system for both males and females?? 

Click here for an interactive quiz on reproductive terms!  

Click here for an interactive quiz on the female reproductive system! 

Click here for an interactive quiz on the male reproductive system!  


Emotional Changes 

Most experts believe that the idea of young teens being controlled by their “raging hormones” is exaggerated. However, at this time in your life you may be experiencing unexplained mood swings, short tempers, sulking and a craving for privacy.

You might be worrying a lot about things like:

  • A romantic crush
  • Your school performance
  • Your appearance, physical development and popularity
  • The possible illness or death of a parent or loved one
  • Being bullied at school
  • School violence
  • Not having friends
  • Drugs and drinking
  • Hunger and poverty in your community
  • Finding a good job
  • Terrorist attacks or natural disasters
  • Parents separating or divorcing
  • Fear of dying
  • Hurting yourself

It’s normal to sometimes feel very self-conscious. You’re experiencing some pretty major physical and emotional changes right now, so it’s normal to feel overly sensitive about yourself. The personal qualities or “defects” that seem like a really big deal to you are probably hardly noticeable to others.

You think:

“I can’t go to the party tonight because everyone will laugh at this baseball-sized zit on my forehead.”

Reality: The pimple is tiny and hidden by your hair.

It’s easy to get caught up in yourself or think that you are the only person who feels the way you feel, or to think that no one else (especially your family) understands you. This can make you feel pretty lonely or isolated sometimes. It can also affect how you interact with your family and friends (for example, “I can’t be seen going to a movie with my mother!”).

Just remember, it’s normal to change from feeling happy to sad and from feeling smart to feeling dumb. You’re in the middle of some major changes, changes that don’t always move steadily ahead.

Watch out for excessive emotional swings or long-lasting feelings of sadness. These can suggest underlying severe emotional problems.

Whether it's you, a friend, or a family member, there is help available when you need it. Click here to learn more. You can also call 1-800-273-TALK (8255) to speak with someone immediately.