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Development (Extraembryonic membranes (Amnion (Encloses fluid around…
Development
Extraembryonic membranes
Amnion
Encloses fluid around embryo
Allantois
Becomes bladder
Yolk sac
Blood formation
Chorion
Becomes placenta
Fertilisation
Normally within 1-2 days of ovulation
Enzymes in sperm penetrate corona radiata
Sperm and egg fuse
Zona pellucida prevent additional sperm from entering
Implantation
Trophoblast enlarges and spreads
Maternal blood flows through lacunae
7 days after implantation
Trimesters
2
Organ system develops
3
Growth and maturation
1
Organ systems appear
Placenta
Exchange
Gas
Nutrients
Wastes
Hormones
Different hormones at different stages of pregnancy
Examples
Human chorionic gonadotropin
Prolactin
Relaxin
Umbilical cord connects to fetus
Chorionic villi extend into maternal tissue
Intricate branching network for maternal blood
Stages of labour
Expulsion
Cervix fully dilated
Baby emerges
Placental
Placenta ejected
Dilation
Cervix dilates
Baby moves towards birth canal
Uterine changes
Progesterone inhibit uterine contractions
Exytocin, oestrogen, prostaglandins stimulate uterine activity
Maternall changes
Increase in
Blood volume
Nutrient intake
Tidal volyme
Kidney filtration rate
Respiratory rate