Let’s Talk about Sex - PowerPoint Presentation

Slide1

Let’s Talk about Sex

Human Sexual ReproductionSlide2

What’s Happening?Slide3

What will I look like when I grow up?

That depends mostly on your

heredity

, the

genes

you got when an egg cell and a sperm cell from your birth parents came together to make the cells that developed into you.

Genes mostly determine how tall you will grow, the colour of your hair, the size and shape of your penis or breasts and your overall body shape.

Other things that affect our body are the foods we eat, how active we are and how much sleep we get. Slide4

What is Puberty?

It is the time when our bodies change toward an adult body.

Start to develop new feelings and interests

Start to make sperm cells

Or

start to make egg cellsSlide5

What is Puberty?

The cells necessary to make a new human

egg + sperm = babySlide6

What changes happen to boys?

Grow taller and heavier

Bones grow bigger and heavier

Nose and jaw get bigger and face gets longer

Get more muscles

Hair and skin can become oily and you may get pimples

Body sweats more

Hair grows on the face, under the armpits, around the genitals (pubic hair). Slide7

May get more hair on arms, legs and chest.

Voice gets deeper

Penis and testicles grow

Scrotum changes

May have mood swings, sexual thoughts and feelings

Breasts may grow

What changes happen to boys?Slide8

What changes happen to girls?

Get taller and heavier

Bones grow bigger and heavier

Hips get wider and more curvy

Face changes shape

Voice gets a little deeperSlide9

Hair grows under the armpits, around the genitals (pubic hair)

Hair on arms and legs grows darker

Breasts and nipples get larger

Body sweats more

Internal and external sex organs grow

May have mood swings, sexual thoughts and feelings

What changes happen to girls?Slide10

What causes these changes?

It is the sex hormones that make the changes that cause children’s bodies grow into adult bodies.

Both boys and girls make the same sex hormones. The main ones are

testosterone and estrogen

Boys make lots of testosterone, not so much estrogen

Girls make lots of estrogen, not so much testosteroneSlide11

What Is The Function Of The Pituitary Gland?The pituitary gland secretes (creates and releases) hormones.For males, these hormones are

testosterone.

For females, these hormones are progesterone & estrogen

.Slide12

The hormones produced by the pituitary gland travel in the bloodstream until they reach the testicles or ovaries to send the signals to produce spermatozoa

or ova. Slide13

Watch this…http://www.brainpop.com/health/geneticsgrowthanddevelopment/puberty/ Slide14

Sexual Reproductive OrgansSlide15

What are the male sex organs?These parts are also called the reproductive organs and genitals

Urethra

Penis

Testicles or Testes

Scrotum

The parts are:Slide16

What are the sex organs?  Urethrathe tube through which urine and semen leaves the boy’s body

Penis tube-like organ that hangs outside the body

come in all sizes and shapes, determined by our genes Testicles or testesusually two, one hangs lower

Sometimes called

balls

or

nuts

Where sperm are made

Scrotum

bag of skin that holds testicles

keeps them at right temperature to make sperm, slightly cooler than body’s temperature

gets bigger and baggier and turns a darker colourSlide17

What happens on the inside?Hormones from the pituitary make the testicles grow and they start making more testosterone and producing sperm After puberty you make

200,000 - 400,000 sperm cells a day for the rest of your lifeSperm build up in tubes around the testiclesThey travel along some tubes and mix with fluids from glandsSlide18

What are the female sex organs?

These parts are also called the

reproductive organs and

genitals

.

The parts on the outside are:

Vulva

The area of soft skin between a female’s legs.

Clitoris

Small organ made of nerves and tissue.

At the top where the lips join.

Only the tip is on the outside, the rest is hidden inside.

Sensitive to touch. Can feel tingly and pleasurable.  

Labia

Soft folds of skin that cover the inner parts

Grow darker and bigger at puberty.Slide19

Urethra

Not a sex organ.

Tiny opening that urine comes out from the bladder.

Vaginal opening

Entrance to the vagina.

Hymen

Thin piece of skin that may cover part of the opening to the vagina.

Often small or missing.

Anus

Between the two cheeks of the buttocks.It is where bowel movements come out.

What are the sex organs? Slide20

The parts on the inside are:

Uterus

Sometimes called the womb.

Muscular organ about the size of a pear.

Where developing baby, called a fetus, grows and is fed.

Where the period comes from

.

Vagina

Warm, soft, moist passageway joining outside and uterus.Slide21

Fallopian tubes

Narrow tubes between the uterus and the ovary.

Ovaries

Glands that make egg cells and female sex hormones.

Cervix

The lower part of the uterus.

Makes mucus to keep sperm alive.

Has opening where sperm enter uterus and where the baby comes out of the uterus.

The parts on the inside are:Slide22

Girls are born with hundreds of thousands of tiny eggs, called ova – one is called an ovum.These egg cells are only half formed.At puberty, hormones tell the ovaries it is time to start releasing ova.

Usually one egg at a time matures (develops) and is released from an ovary.

So what are periods

and why do they happen?Slide23

At the same time, the uterus starts to grow a thick lining on the inside wall.The lining has lots of tiny blood vessels.

The lining is there to protect and feed an egg that has combined with a sperm to form a fertilized egg.

So what are periods

and why do they happen?Slide24

If an egg does not meet a sperm, the lining is not needed.It breaks up.

Mixed with some blood it comes out the uterus into the vagina and then out the vaginal opening.This is called

menstruation but lots of females just call it their period.

If a woman is not pregnant then her ovary will release another egg, the lining build up and, if the egg is not fertilized, she has another period.

This is called the

menstrual cycle.

So what are periods

and why do they happen?Slide25

#1

One ovum matures;

Possibility of fertilization; EstrogenSlide26

Uterus lining begins to thicken;

Ovulation

#2Slide27

#3

Possibility of

fertilization

;Uterus lining continues to thicken;

ProgesteroneSlide28

#4

Unfertilized ovum diesSlide29

#5

Shedding of endometrium

& unfertilized ovum (PERIOD)Slide30

http://msnbcmedia.msn.com/i/msnbc/Components/Interactives/Health/WomensHealth/zFlashAssets/menstrual_cycle_dw2%5B1%5D.swf