Monday, January 9, 2012

Scribe Post for Monday, January 9, 2012

Today In Class:
-Checked UP pgs. 9-14
-Almost Finished Notes on Pregnancy (One slide left)

Key Things to Remember from Notes:
- Gestation: the carrying of developing child in the womb from conception to birth
-Child is carried for approximately 266 days (9 months)
-About one week after conception, the blastocyst implants in the endometrial wall of the uterus
-Trophoblast: outer cell layer of the blastocyst, which becomes part of the placenta
-Placenta: the organ that provides nourishment and oxygen to the embryo, and gets rid of metabolic waste

Amniotic egg4 Pieces of Life Support After
Implantation: (See image above)

1. Amnion: fluid filled sac that encloses and protects the embryo, breaks before child-birth
2. Yolk Sac: produces embryo's first blood and germ cells
3. Allantois: forms part of urinary bladder and umbilical cord
4. Chorion: part of placenta, maintains high levels of estrogen and progesterone in mother's blood for 2 reasons: so new follicles do not mature, and to prevent menstruation

The placenta...
-carries chronic villi: embryonic blood vessels in close contact with material blood supply
-keep in mind: mother and baby's blood DO NOT MIX.
-By diffusion, nutrients, oxygen, antibodies, viruses, and drugs move from mother to embryo and waste moves from embryo to mother.

First Trimester
5-9 weeks
Makes change from embryo to fetus.

5 week embryo
-7 mm from crown to rump (not legs)
-brain and spinal cord
-starting to produce limbs, small tail and gill pouches

9 week fetus

-5.5 cm
-placenta, umbilical cord, amnion

-all organs and body parts present
-can move

Second Trimester
increase in size and refinement

14 week fetus
-6 cm (not large size difference)


-can be performed when fetus is 18 weeks
-shows sex and physical abnormalities

20 week fetus
-19 cm

-1 lb
-nails, eyelashes, and hair are present

Third Trimester
rapid growth

-Premature babies 24 weeks or older may survive with medical care
-circulatory and respiratory systems prepare for breathing
-head of fetus rotates toward cervix
-Birth Averages: 50 cm (20 inches), 2.7-4.5 kg (6-10 lbs)

-rhythmic contractions of uterus controlled by estrogen and oxytocin
estrogen induces oxytocin receptors
oxytocin causes uterus to contract

3 Steps of Childbirth
1. CERVIX DILATES (from 0 to 10 cm) Ave 6-12 hours
2. Full dilation of cervix, strong contractions (Ave 20-60 mins)
-clamp umbilical cord as soon as baby comes out so it gets used to breathing air
3. Delivery of PLACENTA
-15 mins. after birth

-Stem Cell Debate Wednesday
-Review for finals!




  1. This was a really good post. You went into enough detail and the pictures helped me study for the quiz. There really isn't anything wrong that sticks out to me. Great Job!


  2. I agree with Regina, this was a really good post and it even reminded me about diffusion. Thanks now I can use this to study more for my test and Great job Sophia!