Foetal Development

Foetal Development

Human Reproduction

Multiple Choice

Where does fertilisation take place?

• Uterus

• Vagina

• Oviduct

• Ovary

Multiple Choice

Where does a fertilised egg implant?

• Cervix

• Vagina

• Uterus

• Oviduct

Multiple Choice

What is the male sex cell called in humans?

• Sperm

• Pollen

• Egg

• Ovule

Multiple Choice

How many eggs are released each month by a woman?

• 1

• 2

• 10

• 10million

Multiple Choice

What do mitochondria do?

• Produce proteins

• Release energy

• Control the cell

• Photosynthesis

Learning Objectives

• Define zygote, embryo and foetus

• Describe the stages of foetal development

• Compare the gestation of different animals

Open Ended

What do you think the word 'gestation' means?

Hint: Humans = 40 weeks

Gestation

is another word for pregnancy.

In humans it takes 9 months, or 40 weeks for a baby to be born after fertilisation, or 'conception'.

THINK: Which do you think has the shortest and the longest gestation?

Multiple Choice

Which animal has the shortest gestation?

• Cat

• Hamster

• Human

• Elephant

Multiple Choice

Which animal has the longest gestation?

• Cat

• Hamster

• Human

• Elephant

Gestational Periods

• Cat: 64 days

• Hamster: 16 days

• Human: 270 days

• Elephant: 645 days - that's nearly 2 years!

Baby Development

The length of pregnancy depends on the size of the animal - larger animals need more time in the womb (uterus) to grow and develop

Decode the Messages

Gestation masne pagrencyn – the priode fomr fterlsiatioin to btrhi.

Embryo si udes to dsiebcr na aliman in teh wbmo in hte aryle sgaest of dpntevleome, fmro fterlsiatioin to aotbu 9 wkese.

Foetus si an aimaln in teh wmob fmro 9 wskee fater fterlsiatioin ntuil brtih.

Decoded

Gestation means pregnancy – the period from fertilisation to birth

Embryo - An animal in the womb in the early stages of development, from the point of fertilisation to approximately 9 weeks.

Foetus - An animal in the womb from 9 weeks since fertilisation until birth.

Multiple Choice

Which is the correct description: A baby at 20 weeks after fertilisation

• Zygote

• Foetus

• Embryo

Multiple Choice

Which is the correct description: A newly fertilised egg

• Zygote

• Foetus

• Embryo

Multiple Choice

Which is the correct description: A baby 30 days after fertilisation

• Zygote

• Foetus

• Embryo

Stages of Development

Fertilisation: the sperm cell meets the egg cell and their nuclei join together

This is also called conception

30 hours

After fertilisation, the cells start to divide

7 days

The organs start to grow and the baby starts to move

21 days

The baby's heart begins to beat and arms and legs start to grow

Week 8-12

The baby has hands and feet and can move around inside a bag of water, called the amniotic sac.

This sac protects the baby whilst it is growing

Week 16

The baby now has a nervous system and can feel pain and moves around a lot. It has eyebrows and eyelashes

Week 20-24

The baby has hand and footprints. It practices the movements of breathing

Weeks 25-32

The baby's eyes open and close. It sleeps 90% of the time as it grows bigger

Weeks 33-40

The baby is nearly fully grown and is getting ready to be born. It turns upside down before it is born

Week 40

The baby will be born by the uterus contracting and pushing it through the cervix and out through the vagina

Multiple Choice

When do the baby's organs first start to grow?

• 7 days

• Week 16

• Week 20

• Week 33

Multiple Choice

When does the baby start to practice breathing?

• 30 hours

• Day 7

• Week 8

• Week 20

Multiple Choice

Which of these happen right at the end of pregnancy?

• Grows eyelashes

• Develops fingerprints

• Turns upside down

• Heart starts to beat

Multiple Choice

How long is a human pregnancy?

• 3 months

• 9 months

• 12 months

• 18 months

Caesarean Sections

Sometimes it isn't possible for a baby to be born naturally through the vagina and doctors must perform surgery called a Caesarean Section

They make a cut through the woman's tummy and into her uterus and remove the baby

Normally the woman is awake for this surgery but cannot feel anything!

Open Ended

Any questions?