Notes on trimesters

Report
Start Strong, Finish Strong
Pick up: New DSQ paper
Mon, Sept 2, 2014
Please make
sure your
phones are in
your bags up
front.
Today you will:
1.Receive clicker number
2.Learn what happens during each trimester
3.Review with clickers if time
Homework/Planner:
Quiz on Topic 3-Fetal Development Tomorrow!
Daily Science Question
Look in your book:
What is the purpose of the amniotic sac/fluid?
 https://www.youtube.com/watch?v=QSN5gfb
zgwc
TriMesters
ISN pg 31 TB pg 800-801
3 distinct periods of GROWTH &
DEVELOPMENT
1st TriMester
1. Dramatic changes
2. Embryo  Blasto
Gastrulation
2nd TriMester
1. SKELETON
begins to form
3. AMNIOTIC SAC: sac 2. Soft hair (lanugo)
in which fetus develop
develops over
skin
4. PLACENTA: organ
connecting fetus to the
3. FIRST
uterine wall- allow
nutrient uptake, waste
MOVEMENTS
elimination, gas
exchange via the
4. Fetus wakes &
mother's blood supply
sleeps
5. ALL ORGAN
SYSTEMS HAVE
BEGUN TO FORM:
1.
2.
3.
Brain
Heart – heartbeat after
5wks
Kidneys
3rd TriMester
1. FETUS
RESPONDS TO
LIGHT, MUSIC
2. NERVES FORM
IN LARGE
NUMBERS
3. FAT DEPOSITS
under skin
DEVELOP, so it
can maintain
body temp AND
survive when
born
14 week old fetus
Amniotic Sac
Umbilical Cord
Placenta
5
mm
14 weeks
What Your
is a very
Belly
Button???
first scar.
http://www.blogthings.com
/whatdoesyourbellybutton
ayaboutyouquiz/
1. Scar tissue left over from where umbilical cord joined you
to your mother's placenta when you were in her womb.
2. Nourishment going to the baby & all wastes coming out
passed through belly button, via the umbilical cord.
3. Once delivered, umbilical cord was usually clamped or tied, and
then cut  stump withers & falls off after a few days, leaving
behind the scar we call the belly button.
 Organ
The Placenta
created during pregnancy to
nourish fetus, remove its waste &
prod. hormones to sustain
pregnancy.
 Attached to wall of uterus by blood
vessels that supply fetus with
oxygen & nutrition & remove waste
from fetus & transfer it to mother.
 Fetus attached to placenta by
umbilical cord. Through this, the
fetus receives nourishment &
oxygen & expels waste.
 On one side of the placenta, the
mother's blood circulates, and on
the other side, fetal blood
circulates.
http://pregnancy.about.
com/cs/placentas/a/pla
http://pregnancy.about.c
om/cs/rhfactor/a/aa0506
 Colored
Villi
scanning electron micrograph (SEM) of
in placenta at the time of childbirth.
 Villi
 projections of fetal
tissue into maternal part of
the placenta
 Packed with blood vessels,
allowing the fetus' blood
supply to come very close to
the mother's blood.

This allows the exchange of
gases, nutrients & waste with
mother's blood, as the fetus
cannot breathe, feed or
excrete while in the womb
Speaking of the Amniotic Sac, Placenta… the Afterbirth
http://video.an
placentas-hel
516946810
Many
people of the world
have known the secret
power of the placenta as a
medicinal supplement.
http://www.birthtoearth.com/FAQs/Placenta
+Traditions.html





For many the placenta represents the “giver of life” – they will plant the
placenta under a tree
Among the Chinese and Vietnamese, it is a customary practice to prepare the
placenta for consumption by the mother. The placenta is thought to be rich in
nutrients that the mother needs to recover more readily from childbirth.
In Italy, women have been known to eat parts of the placenta to help with
lactation.
Hungarian women bite the placenta to expedite the completion of labor. And
knowledgeable midwives in this country have their birth mothers take bites of
raw placenta to help stop hemorrhaging, due to its beneficial oxytocin content.
there is no medical reason to eat the placenta; "Animals eat their placenta to get nutrition - but when
people are already well-nourished, there is no benefit, there is no reason to do it."[6] On the other hand,
American Medical anthropologists at the University of South Florida and UNLV, surveyed
new mothers, and found that about 3/4 had positive experiences from
eating their own placenta, citing "improved mood", "increased energy", and
"improved lactation".[7] [8]

Human placenta has also been an ingredient in some traditional Chinese medicines,[9] including using dried
human placenta, known as "Ziheche" (simplified Chinese: 紫河车; traditional Chinese: 紫河車; pinyin:
Zǐhéchē), to treat wasting diseases, infertility, impotence and other conditions.[10]
Practice Questions for this unit…
1.Which of the following is true of a zygote?
A. It forms into a blastocyst
B. It is an unfertilized egg
C. It produces haploid male gametophytes
D. It is made up of only one cell
In which of the following structures of the female
human reproductive system is the blastocyst
implanted during normal human development?
A. ovary
B. uterus
C. vagina
1.What of the following is the correct order of
development?
A. Zygote – blastocyst – morula – embryo – fetus - baby
B. Morula – blastocyst – embryo – fetus – baby
C. Zygote – morula – blastocyst –embryo – fetus - baby
Below is a diagram of the male reproductive system.
A.
1.Which structure is represented by the letter A?
A. Scrotum
B. Testes
C. Epididymis
1.Sperm are created through meiosis in an
area of the testes called the seminiferous
tubules. Through which structure do the
sperm travel to exit the testes?
A. vas deferens.
B. seminiferous tubules
C. epididymis
1.Abnormalities present in the cells that line the
uterus may prevent the production of offspring by
directly interfering with which process?
A. the secretion of estrogen by the ovary
B. the production and release of egg cells
C. the development of the embryo
1.The drinking of alcoholic beverages by a pregnant
woman is harmful to the development of her
fetus. This is most damaging early in a pregnancy
during this time because…
A. the lungs of the fetus become functional.
B. many of the essential organs of the fetus are
forming.
C. the fetus cannot excrete wastes.
1.The human mother’s body nourishes the growing
embryo during pregnancy. Which structure
nourishes the embryo and removes wastes
through a network of blood vessels?
A. ovary
B. placenta
C. uterus
1. The point at which the umbilical cord attaches to the fetus
becomes the belly button after birth. What is the function of
the umbilical cord for mother and fetus during fetal
development?
A. Liquids consumed by the mother flow through the
umbilical cord and into the stomach of the fetus.
B. Nutrients from the mom pass from her blood and waste
products produced by the fetus travel through the
umbilical cord and out through the mother’s kidneys.
C. Nutrients from foods digested by the mother pass from her
blood to the fetus through blood vessels in the umbilical
cord.

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