QUIZ 2 (PHYSICAL SELF) Flashcards
3 STAGES OF PRENATAL DEVELOPMENT
GERMINAL STAGE, EMBRYONIC STAGE, FETAL STAGE
The first stage of prenatal development,
during which the dividing mass of cells has not
become implanted in the uterine wall.
GERMINAL STAGE
FIRST TWO WEEKS OF CONCEPTION
GERMINAL STAGE
The action of conceiving a child
CONCEPTION
Fertilized ovum or egg cell
ZYGOTE
The zygote becomes implanted in the uterine wall
CONCEPTION THROUGH IMPLANTATION
Implantation until about 8th week
EMBRYONIC STAGE
Major organ systems are formed and begin to
take shape; now called the __
EMBRYO
___ - Later becomes the brain and spinal cord
Neural tube
The period of 2 to 8 weeks after conception.
EMBRYONIC STAGE
What week the primitive heart begins to beat and pump blood?
4th Week
Genetic code (XX or XY); Causes sex organs to
differentiate
7th Week
XY CHROMOSOMES
MALE
XX CHROMOSOMES
FEMALE
The embryo is suspended in an
_____.
amniotic sac.
Nutrients and wastes are exchanged
with mother through ____
placenta
a sac within the uterus that contains the embryo or
fetus
AMNIOTIC SAC
A membrane that permits the exchange of nutrients
and waste products between the mother and her
developing child
PLACENTA
The embryo is connected to the placenta
by the ____
umbilical cord
A tube between the mother and her developing child
through which nutrients and waste products are conducted
UMBILICAL CORD
At this point, the fetus is covered with fine,
downy hair called ____
lanugo
Beginning of third month (9th week) until
birth
FETAL STAGE
All major organs as well as fingers and
toes develop by the 12th week.
FETAL STAGE
The fetus grows more than __ fold in
weight during the 2nd trimester (_ oz. to _
lbs.)
30, 1 to 2
