Can you read through the word lists for this topic please? Do now! Can you read through the word lists for this topic please? He’s going to blow! Be careful Good Neutral Excellent MOODOMETER

The Menstrual Cycle What can you remember?

TRUE or FALSE? A woman normally has a period every 23 days

It is normally every 28 days TRUE or FALSE? A woman normally has a period every 23 days It is normally every 28 days

TRUE or FALSE? Menstruation is the name for when the egg is released from the ovary ¡Estoy libre!

This is called OVULATION TRUE or FALSE? Menstruation is the name for when the egg is released from the ovary This is called OVULATION

TRUE or FALSE? If sperm are present the egg is normally fertilised in the oviduct

TRUE or FALSE? If sperm is present the egg is normally fertilised in the oviduct

TRUE or FALSE? A woman stops producing eggs between the ages of 45 and 55. This is called menstruation.

This is called the MENOPAUSE TRUE or FALSE? A woman stops producing eggs between the ages of 45 and 55. This is called menstruation. This is called the MENOPAUSE

TRUE or FALSE? An egg is released roughly halfway between periods (after about 14 days)

TRUE or FALSE? An egg is released roughly halfway between periods (after about 14 days)

Menstrual Cycle 2 Can you complete the sheet “Menstrual Cycle 2”?

The rest of today’s lesson (and tomorrow!) Know how a fertilised egg develops into an embryo Know about implantation Know how the developing baby is protected Know how the developing baby is supplied with food and oxygen and how waste is taken away. Know how long pregnancy lasts

Sexual reproduction

Sexual reproduction Requires two parents, a male and female.

Sexual reproduction Both have sex organs

Sexual reproduction The sex organs make sex cells

Sexual reproduction In male animals the sex cells are called sperm, made in sex organs called testes (testis is singular) I can stay alive in the vagina for up to 3 days waiting for an egg to be released.

Sexual reproduction In female animals the sex cells are called eggs, made in sex organs called ovaries. An egg is released from the ovaries about every 28 days. This is called ovulation.

Sexual reproduction During sexual reproduction the sperm and egg join together (fertilisation)

Sexual reproduction A fertilised egg is produced.

Sexual reproduction The egg cell begins to divide forming a ball of cells. Stem cells – have the potential to become any type of cell

Sexual reproduction It may take several days to reach the uterus and be implanted in the soft lining. It is now an embryo.

After 8 weeks I am called a fetus. Sexual reproduction Finger–like projections grow into the uterus forming a plate like structure called the placenta. After 8 weeks I am called a fetus.

Sexual reproduction The umbilical cord joins the fetus to the placenta.

The placenta In the placenta food and oxygen diffuse from the mother’s blood to the fetus’ blood, and carbon dioxide and waste products diffuse the other way.

The placenta In the placenta the blood of the fetus flows close to the blood of the mother, but they do not mix. Why?

The placenta In the placenta the blood of the fetus flows close to the blood of the mother, but they do not mix. The mother’s blood under higher pressure would burst the vessels in the developing fetus. They may have different blood types.

Amnion The fetus is surrounded by a fluid-filled sac (amnion) filled with amnionic fluid. This protects the baby.

Week 8 Baby's spinal column are beginning to form around week 5 Heart is beating Lungs are formed Eyes and ears are developing All internal organs are in place by week 8 Genital organs are visible

Week 12 Inner ear, external ears, eyes, mouth and nose are developing Heart is pumping blood to all parts of the body

Week 16 Baby is now completely formed From now on, growth will be rapid Heartbeat can be heard with ultrasound Baby's weight has more than doubled from week 15 to week 16 Baby is moving quite vigorously

Week 20 Baby is covered in fine hair Muscles are developing rapidly Teeth are beginning to form Hair is growing on baby's head Baby is very active

With special care I could survive if born now Week 24 Baby can suck its thumb Baby can hiccup and cough Baby weighs just over 1 pound With special care I could survive if born now

Week 28 Vernix coats the baby's skin Baby's lungs are mature Fat is starting to accumulate Baby weighs approximately 2 pounds

Week 32 Most babies are in the head down position Baby weighs approximately 3.5 pounds

Week 36 Baby continues to gain weight The irises of the eyes are now blue Baby weighs approximately 5 pounds

Week 40 Most of the vernix on the baby is gone Baby's eyes are open and it can distinguish light

Time to leave!

The big questions When does new life begin? When is it a person? When is it alive?

Can you complete the sheets “Pregnancy” and “The Developing Fetus”

Can you then try reading pages 27 and 28?