UNSELF MIDTERMS PHYSICAL AND SOCIAL SELF Flashcards
The Beginning of life
(Carnegie Stages of Human development is by?)
by Dr. Mark Hill
Stage 1 (Zygote) - Stage 22 ( 54-58 days)
Prenatal Development
Enu. the stages
- 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. - Conception through implantation
- Zygote (fertilized ovum or egg cell)
divides and becomes implanted in the
uterine wall.
- Germinal Stage
(fertilized ovum or egg cell)
divides and becomes implanted in the
uterine wall.
Zygote
- The first two weeks after conception
- The ________ spans the time
from fertilization to implantation in
the wall of the uterus. - For the first three or four days the
mass of dividing cells moves about
the uterus before implantation
GERMINAL STAGE
testes form and produce androgens
Y sex chromosome
- Embryonic Stage
- Implantation until about 8th week
- Major organ systems are formed
- 5-6: nondescript
- 7: Genetic code (XX or XY) causes sex organs to differentiate
- Y sex chromosome – testes form and produce androgens
- Embryonic Stage
- Embryonic Stage
During the 4th week, a
________ begins to
beat and pump blood—in an organism that is one-fifth of an inch long.
primitive heart
- The period of 2 to 8 weeks after
conception. - Major organ systems begin to take
shape, which is now called the
embryo. - Nervous system, head and blood
vessels form at this time as well
- Embryonic Stage
- Major organ systems begin to take
shape, which is now called the
_______.
embryo
- Embryonic Stage
- Embryonic Stage
* Embryo is suspended in _________ (a sac
within the uterus that contains the embryo or
fetus.
amniotic sac
- Embryonic Stage
At this midway point bet. conception and birth, the fetus is covered with fine, downy hair, called______
lanugo
- Embryonic Stage
* Nutrients and wastes are exchanged with
mother through ________ (a membrane that
permits the exchange of nutrients and waste
products between the mother and her
developing child but does not allow the
maternal and fetal bloodstreams to mix)
placenta
- Embryonic Stage
Embryo is connected to
placenta by _____ (a tube between
the mother and her
developing child
through which nutrients
and waste product are
conducted)
umbilical
cord
- Beginning of third month until birth
- Organ systems; fingers and toes ( 12th week)
- Mid: 4th week: movements
- 6th week: limbs
- Characterized by maturation &
gains in size - 5 ½ pounds (fetus)
- 7 ½lbs (newborn boys)
- 7 lbs (newborn girls)
- Fetal Stage
- Fetal Stage
* The fetus reached the age of ______,
where it could sustain life on its own
outside of the womb
viability
Chromosomal abnormalities…
(COMMON DISORDERS)
*DOWN SYNDROME
* EDWARDS SYNDROME
* PATAU SYNDROME
*GENOTYPE XXY
*GENOTYPE X
*TRISOMY 21 -DOWN SYNDROME
* TRISOMY 18 - EDWARDS SYNDROME
* TRISOMY 13- PATAU SYNDROME
* KLINEFELTER SYNDROME - GENOTYPE XXY
*TURNER SYNDROME - GENOTYPE X
SEX CHROMOSOMES
XX is _____
XY is _____
XX is female
XY is male
THREATS TO PRENATAL DEVELOPMENT
- __________is related to
premature birth and low birth weight.
Maternal malnutrition
THREATS TO PRENATAL DEVELOPMENT
- The risk of _______, a neural tube
defect, can be reduced if vitamins
containing folic acid are taken
during pregnancy.
spina bifida