Week 11 Lecture (Pregnancy) Flashcards
Conception
Fertilization of egg by sperm
First step of Conception
Ovulation: egg released from the ovary, picked up by fimbriae and enters the fallopian tube
How many sperms are lost on the way to fertilize the egg
200-400 mil sperm start out, 50% flows back out the vagina, others die from acidity, of sperm that survive that half go through the wrong tube, at that point only 200-300 sperm make it as far as the egg
how big is the window post ovulation to fertilize egg
24hrs
how long do sperm live in vagina
48 hrs up to 8 days
Sperm work together to dissolve BLANK by secreting BLANK to get through to the egg
dissolve the zona pellucida by secreting hyaluronidase to get through to the egg, then the zona thickens again to prevent other sperm
How many sperm makes through to the egg and where does conception occur
1 sperm fertilizes the egg in the fallopian tube
Whats a fertilized egg called
Zygote
How long it take for zygote to plant in uterus
zygote goes from fallopian tube and plants in uterus taking 5 days
Is absence of period a sure way to know pregnant
no, could be from stress or smth else, and also spotting/bleeding can happen during implantation
Symptoms of pregnancy
tenderness of nipplesm nausea/vomiting, constant peeing and fatigue
What tests are designed to detect pregnancy
chemical tests to find HCG (human chorionic gonadotropin) in women pee
What are some pregnancy tests by 3rd of 4th month of pregnancy
fetus heartbeat, movement, ultrasound
for ppl 25-34, without prevention, chance of getting pregnant after 1 yr of trying is:
85%
Whats Nagele’s Rule
To calculate Delivery date use nageles rule:
menstruation start date - 3 months + 7 days + 1 year = estimated due date
Gestation
time from conception until birth, usually 280 days (40 weeks)
How many trimesters in pregnancy
3 trimesters, 3 months each
whats the Embryonic Stage
First 8 weeks of pregnancy from conception, placenta (uterus for pregnancy) develops
- Connects fetus to wall of uterus for oxygen and nutrients
- separates parents circulatory system from fetus
- Placenta takes over secretion of progesterone and estrogen from the corpus leuteum
What 2 thinks happen in the embryonic stage
placenta (uterus for pregnancy) develops
- Connects fetus to wall of uterus for oxygen and nutrients
- separates parents circulatory system from fetus
- Placenta takes over secretion of progesterone and estrogen from the corpus leuteum
Amniotic Sac develops (the sac holding water protecting embryo)
- protects emryo from damage and temp
Describe the 3 months of the first trimester for embryo development
Month1
- most major organce develop
Month 2
- Umbilical cord develops and attaches embryo to placenta
- further development (face feet major blood vessels)
Month 3
- now the embryo is a fetus
-limbs and hair are now pronounced
- can see gender in ultrasound
First trimester effects on the mother
tingling, fullness of breasts, nausea, changes in appetite, frequent peeing, increased vaginal secretion
First trimester starts morning sickness (which can be at any time) associated with lower miscarriage rates
first trimester usually uncomfy
When does embryo become fetus
In third month of first trimester
Second trimester effects on fetus
fetal movements can be detected,
Fifth month
- heartbeat heard with stethoscope
Sixth Month
- fetus can open its eyes
End of second trimester fetus is sensitive to light and sound
If baby was born in second trimester, would it survive
fetus cannot live on own at this point unless tech assistance provided