Fearfully and Fearfully and Wonderfully Wonderfully

MadeMade

•Gestation – Period of development before birth (38-40 weeks in Humans)

•Amniotic Sac – Fluid filled sack that protects the child during gestation

•Placenta – Sac of blood vessels that provide the materials from the mother the child needs

•Umbilical Cord – The three vessels that transport nutrients and wastes from the placenta to the child

•2 to transport nutrients and 1 to transport wastes

Nervous systemNervous system

•Week 3 – Neural plate appears which develops into the nervous system

•Week 6 – Brain is sending out impulses to control body functions and movements

•Week 7 – Will respond to touch

•Week 12 – Brain is fully formed but continues to grow

Digestive SystemDigestive System

•Week 3 – Digestive tube is present

•Week 6 – Stomach produces digestive juices

Circulatory SystemCirculatory System

•17 Days – Blood cells are present

•Week 3 – The heart begins to beat

•Week 4 – Network of blood vessels is developed

•Week 8 – Heart is fully developed but continues to grow

Respiratory SystemRespiratory System

•Week 4 – Lungs, trachea, and bronchial tubes begin to form but are not used until born

Skeletal SystemSkeletal System

•Week 5 - Skeleton is taking shape made mostly of cartilage

•Week 8 – Ossification (the replacement of cartilage with bone) starts and continues until age 25

Other SystemsOther Systems

•Week 6 – Able to move voluntary muscles to move around

•Week 6 – Kidneys filter uric acid from the blood

•Week 10 – Kidneys are fully functioning

FertilizationFertilization

ZygoteZygote

ZygoteZygote

2 Cells2 Cells

4 Cells4 Cells

8 Cells8 Cells

BlastocystBlastocyst

BlastocystBlastocyst

6 Weeks6 Weeks

6 Weeks6 Weeks

7 Weeks7 Weeks

7 Weeks7 Weeks

8 Weeks8 Weeks

8 Weeks8 Weeks

10 Weeks10 Weeks

10 Weeks10 Weeks

14 Weeks14 Weeks

14 Weeks14 Weeks

16-20 Weeks16-20 Weeks

18 Weeks18 Weeks

18 Weeks18 Weeks

21 Weeks21 Weeks

24 Weeks24 Weeks

25 Weeks25 Weeks

28 Weeks28 Weeks

5 Months5 Months

32 Weeks32 Weeks

6 Months6 Months

6 Months6 Months