1. What is going on in these pictures? 1 2 34

2. 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 123456 789101112

3. . OVULATION The mature follicle releases the egg

4. 1. Fertilization Joining of sperm and ova Zygote: a fertilized egg

5. 2. Mitosis (cell division) Within 24 hours the cell starts to divide into 2

6. 3. Blastula –hollow ball of cells By day 3, there are 8 cells

7. 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

8. 5. Embryo (gastrula) –Cells differentiate has three distinct layers Amnion: fluid filled sac to cushion baby

9. 6. Placenta – nutrients exchanged Placenta is the gas and nutrient exchange between mother and baby Umbilical cord carries these gases and nutrients to embryo

10. 7. Fetus - Most systems have differentiated At 8 weeks, the developing embryo is called a fetus Most of the systems have differentiated

11. 8. Fetus –movement and bones 12 weeks – movement 16 weeks - bones

12. Fetus

13. 9. Ready for birth Head is down Amnion is broken Labor – uterus contracts Cervix dilates

14. 10. Delivery (it’s a baby) Filling its lungs for the first time is hard work

15. 11. Premature baby 30 weeks it can survive Not fully developed respiratory system

16. After birth Mother will go through labor contractions to expel the placenta and amnion