Pregnancy Flashcards
Where does fertilisation occur?
Outer 1/3 of fallopian tube
What happens in fertilisation
Egg is grabbed by fimbraiae and wafted along by peristalsis
In what scenario is the mucous plug passable
When the oestrogen/progesterone levels are high
What happens in the acrosomal reaction?
enzyme breaks down the zona pellucida
What is the zona pellucida and what is its role?
Chemical change to prevent polyspermy
When does implantation occur?
7-10 days
What happens with implantation
Blastocyst sticks to endometrium
sticky glycogen
sawtooth glands?
What does the trophoblast do
Digests wall of endometrium
Benefit of the placenta
more permanent metabolic attachment
What happens to the chorion
erodes the decidua
large blood filled spaces
chorionic anticoagulants
What are the functions of the placenta
Gas and nutrients exchange
Protection from teratogens and pathogens
manufacture of hormones
What does the placenta act as?
barrier from chorionic tissue and capillary walls
What are the hormones of pregnancy
Human chorionic gonadotrophin hormone
Oestrogen
progesterone
What hormones need to be high for pregnancy to occur
oestrogen
progesterone
Where does the hCG come from
secreted from trophoblasts from chorion
