What is going on in these pictures?1 2

3 4

Stages of Human development• 1. Cut out the stages of human development.• 2. sequence.• 3. Set up your paper for notes• 4. Follow instructions to glue in pictures and write notes

1 2 3 4 5 6

7 8 9 10 11 12

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OVULATION The mature follicle

releases the egg

1. Fertilization Joining of

sperm and ova Zygote:

a fertilized

egg

2. Mitosis (cell division)

• Within 24 hours the cell starts to divide into 2

3. Blastula –hollow ball of cells

• By day 3, there are 8 cells

4. Blastocyst –enters the uterus

• This hollow ball of cells is now 4 days old and enters uterus.

• Implantation is the attachment of the blastocyst to uterus

5. Embryo (gastrula) –Cells differentiate

• has three distinct layers

• Amnion: fluid filled sac to cushion baby

6. Placenta – nutrients exchanged

• Placenta is the gas and nutrient exchange between mother and baby

• Umbilical cord carries these gases and nutrients to embryo

7. Fetus - Most systems have differentiated

• At 8 weeks, the developing embryo is called a fetus

• Most of the systems have differentiated

8. Fetus –movement and bones

• 12 weeks – movement• 16 weeks - bones

Fetus

9. Ready for birth

• Head is down• Amnion is broken • Labor – uterus

contracts • Cervix dilates

10. Delivery (it’s a baby)

Filling its lungs for the first time is hard work

11. Premature baby

• 30 weeks it can survive

• Not fully developed respiratory system

After birth

• Mother will go through labor contractions to expel the placenta and amnion