Pregnancy overview Flashcards
How long does pregnancy last?
38 weeks
Fertilization
When genetic material from a haploid sperm and a haploid ovum merge into one diploid nucleus
where does fertiliation of ovum occur?
about 1/3 way down a uternine tube within 12-24 hours of ovulation
What is a fertilized ovum called?
a zygote
identical (monozygotic) twins
when one single ovum spits
-have same exact genetic material
-always same sex
Fraternal (dizyotic twins)
from 2 eggs and 2 sperm
-can be different sex
hatching…
zygote becomes blastocyst
______ cells become the embryo
Embroylast
______ cells become the placenta
trophoblast
implantation
-attatchment of a blastocyst to endometrium
-occurs 7-8 days after fertilization
Full term is considered _____ weeks.
But baby is fully ready at _____ weeks.
full term is 40 weeks
baby is fully ready at 36 weeks
first trimester
-0 to 3 months
-first two months is called the EMBRIONYIC period where embryo is developed
-placenta is functioning by end of first trimester
when does the amnion typically develop?
by day 8 after fertilization
Placenta
*4 functions
-allows for 02 and nutrients to diffus into fetal blood from moms blood. Co2 and waste from babies blood goes to moms blood
-provides protection (most microorganisms can’t cross it)
-stores nutrients
-produces several hormones that are needed for pregnancy
umbilical cord
-Vascular connection between placenta and fetus
umbilical cord vessles
has two arteries that carry ______ blood to placenta.
has one umbilical vein that carries _______ blood to fetus.
- has two arteries that carry deoxygenated blood from the fetus to the placenta
- Has one umbilical vein that carries oxygenated blood to the fetus
Second trimester
-4 to 6 moths
-continued development of organ systems
-by 6th month the fetus looks like a human
third trimester
- from month 7 to 9
-rapid fetal growth and adipose tissue deposition
-most major organs are functional by month 7
At what month does a baby have a good chance of survival?
SEVEN (7) months!!!
