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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
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