Exam 2 Flashcards
not being able to get pregnant after a year of trying—is equally likely to be traced to the man as to the woman and stems from a variety of causes.
Infertility
a condition arising when bits of tissue lining the uterus grow outside the uterus.
endometriosis
Infertility traced to women may be related to
problems with ovulation blocked _______ or ________
fallopian tubes, endometriosis
(also called intrauterine insemination), which involves
injecting sperm, either from a woman’s partner or from a donor, into her uterus.
artificial insemination
in which several eggs are removed from a woman’s ovary
and manually combined with sperm in a laboratory dish before
being returned to a woman’s uterus in hopes that one egg will
implant on the wall of the uterus
in vitro fertilization
(IVF),
experts who _______
study early growth and development, divide prenatal development
into three stages or periods: the germinal period, the embryonic
period, and the fetal period
embryologists,
The first trimester begins with the ________ which lasts
approximately 2 weeks; the important events of this period are outlined i
germinal period
_______ a hollow ball of about 150 cells that is the size of the head of a piN
blastocyst
(also called spontaneous abortion)
miscarriage
The first trimester continues with the
______which occurs from the third to the eighth week after conception.
embryonic period
During this short
time, every major organ takes shape, in at least a primitive form, in a
process called
organogenesis
these events go with what period?
Day 1: Fertilization usually occurs within 24 hours of ovulation.
Day 2: The single-celled zygote begins to divide 24–36 hours after
fertilization.
Day 3: The mass has 12–16 cells and is called a morula; it travels down the fallopian tube to the uterus.
Day 4–5: An inner cell mass forms; the entire mass is called a blastocyst and is the size of a pinhead.
Day 6–7: The blastocyst attaches to the wall of the uterus.
Day 8–14: During the second week, the blastocyst becomes fully embedded in the wall of the uterus. It now has about 250 cells.
Germinal
events of….. Week 3: Now an embryo, the person-to-be is just 1/10 of an inch (2 mm) long. It has become elongated, and three layers emerge—the ectoderm, mesoderm, and endoderm.
Week 4: The embryo is so curved that the two ends almost touch. The outer layer (ectoderm) folds into the neural tube. From the mesoderm, a tiny heart forms and begins to beat. The endoderm differentiates into the gastrointestinal tract and lungs. Between days 21 and 28, eyes develop. 5 Ears, mouth, and throat take shape. Arm and leg buds appear. The handplate, from which fingers will emerge, appears. The heart divides into two regions, and the brain differentiates into forebrain, midbrain, and
hindbrain.
Week 6–7: The embryo is almost 1 inch long. The heart divides into nfour chambers. Fingers emerge from the handplate, and primitive facial features are evident. The important process of sexual differentiation begins.
Week 8: Most structures and organs are present. Ovaries and
testes are evident. The embryo begins to straighten and
assumes a more human appearancents
embryonic period
The outer layer becomes both the , a
watertight membrane that fills with fluid that cushions
and protects the embryo
amnion
the ______ a membrane
that surrounds the amnion and attaches rootlike extensions called villi to the uterine lining to gather nourishment for the embryo
chorion
the layers of the blastocyst differentiate, forming structures that substain development called:
amnion and chorion
The chorion eventually becomes the lining of the _____
placenta
The ______ eventually becomes
the lining of the placenta
chorion
fill in the blank:
A membrane called __________ allows these small
molecules to pass through _________ but it prevents the of embryo and mother from mingling
the placental barrier and large
blood cells
Through the placenta and umbilical cord, the embryo receives ______ and _____ from the mother and eliminates carbon dioxide and metabolic wastes into the mother’s bloodstream
oxygen and nutrients
includes (brain and spinal cord) from
the
ectoderm
muscles, bones, cartilage, heart, arteries, kidneys, and gonads from the
mesoderm
gastrointestinal tract, lungs, and bladder from the
endoderm
in which part of the spinal cord is not fully encased in the protective covering of the spinal column
spina bifida
The _______ lasts from the ninth week of pregnancy until
birth, which means it encompasses part of the first trimester and
all of the middle and last trimesters
fetal period
pregnancies, the neural
tube fails to fully close (Liptak, 2013). When this happens at
the bottom of the tube, it can lead to _______ , in which
part of the spinal cord is not fully encased in the protective
covering of the spinal column
spina bifida
Failure to close at the top of the neural tube
can lead to ________, a lethal defect in which the main
portion of the brain above the brain stem fails to develop
anencephaly
__________, the primary male sex hormone
that stimulates the development of a male internal reproductive
system, and another hormone that inhibits the development of a female internal reproductive system
testosterone
Week/ Event
9 Bone tissue emerges, and the embryo becomes a fetus. The head of the fetus looks huge relative to the rest of the body—it takes up
about half the total length of the fetus. The fetus can open and close its mouth and turn its head.
10–12 Fingers and toes are clearly formed. External genitalia have developed. Movements have increased substantially—arms and legs kick
vigorously, but the fetus is still too small for the mother to feel all these movements. The fetus also shows “breathing” movements
with its chest and some reflexes.
13–16 The heartbeat should be audible with a stethoscope. Fetal movements may become apparent to the mother. The fetus is about 4½
inches long, and the skeleton is becoming harder.
17–22 Fingernails and toenails, hair, teeth buds, and eyelashes grow. Brain development is phenomenal, and brainwaves are detectable.
23–25 These weeks mark the age of viability, when the fetus has a chance of survival outside the womb. It is about 12 inches long and
weighs about 1 pound.
26–32 The fetus gains weight, and its brain grows. The nervous system becomes better organized.
33–38 The last 6 weeks of a full-term pregnancy bring further weight gain and brain activity. The lungs mature and begin to expand and contract.
events of the fetal period
_______ of
neurons involves their multiplying at a staggering rate during this period; by one estimate, the number of neurons increases by
hundreds of thousands every minute throughout all of pregnancy,
Proliferation
In _____ the neurons move from their place of origin
in the center of the brain to particular locations throughout the
brain where they will become part of specialized functioning
units.
migration
, or transformation of cells, is occurring
differentiation
the fetus
reaches the ________, when survival outside the uterus is possible if the brain and respiratory system are sufficiently developed
age of viability
During the second half of
pregnancy, neurons not only multiply at an astonishing rate
(proliferation) but they also increase in size and develop an insulating cover, ______ that improves their ability to transmit
signals rapidly.
myelin,
The general idea of ______ is that environmental events and maternal conditions during pregnancy may
alter the expected genetic unfolding of the embryo/fetus or reset
its physiologic functions.
fetal programming
______ People shape their physical and social environments
and are, in turn, affected by the environments they have helped
create.
For example, if a woman uses cocaine during pregnancy
reciprocal
influences
A _______ is any disease, drug, or other environmental agent
that can harm a developing fetus
teratogen
The effects of a teratogenic agent are worst during the ______ when an organ system grows most
rapidly.
Critical period
_________The greater the level of exposure and
the longer the exposure to a teratogen, the more likely it is that serious damage will occur.
Dosage and duration.
________ Susceptibility to harm is influenced by the
genetic makeup of the unborn child as well as the mother’s
genotype. Some fetuses are more (or less) resistant to teratogens and some mothers are more (or less) able to detoxify teratogens
Genetic makeup
The effects of a teratogen depend on the quality
of both the prenatal and the postnatal __________
Environment.
A period of rapid growth is a ______ for an organ system
critical period
Why is a period of rapid growth consider to be critical period for an organ system?
a time during which the developing organism is especially sensitive to environmental influences, positive or negative.
in which a sleeping baby suddenly stops breathing and dies. F
sudden infant death syndrome
with noticeable physical symptoms such as a small head and distinctive facial
abnormalities including thin upper lip, short nose, and flat midface
fetal alcohol syndrome (FAS)
the life-threatening illness caused by the human immunodeficiency virus (HIV)
acquired immunodeficiency syndrome (AIDS),
mothers can transmit the virus (what virus) to their babies
(1) prenatally, if the virus passes through the placenta
(2) perinatally,
when blood may be exchanged between mother and child as the
umbilical cord separates from the placenta;
(3) postnatally, if
the virus is transmitted during breast-feeding. Without treatment,
somewhere between 15% and 35% of babies
HIV-infected
dieases that can cause miscarriage or stillbirth as many as 25% of cases where the mother is infected with it
and does not receive treatment
Syphilis
The air we breathe contains numerous _______,
including ozone, carbon monoxide, nitrogen oxides, sulpher dioxides, and lead.
pollutants
is the environment surrounding
birth; it includes influences such as drugs given to the mother during labor, delivery practices, and the social environment shortly
after birth.
perinatal environment
high-risk pregnancies associated with delivery complications, a maternal–fetal specialist, or _______ is
recommended. H
perinatologist
, or oxygen
shortage (also called asphyxia)
anoxia
_______ can occur for any number of reasons—for example, because the umbilical cord becomes
pinched or tangled during birth, because sedatives given to the mother reaches the fetus and interferes with the baby’s breathing because mucus lodged in the baby’s throat prevents normal breathing, or because the baby is in a breech presentation
Anoxia
(feet or buttocks first) during a vaginal delivery
breech presentation
________ a neurological disability primarily associated with difficulty controlling muscle movements; it also increases the risk of learning or intellectual disabilities and speech difficulties
cerebral palsy
_______ a surgical procedure in
which an incision is made in the mother’s abdomen and uterus so that the baby can be removed.
cesarean section
condition is _______—an episode of clinical depression lasting 2 or more
weeks
postpartum
depression
called ______ (from the French word meaning “to hatch”), include bloating, weight gain, fatigue, insomnia, and nausea
couvade
_______—the events of the first month
and how parents might optimize the development of young infants
neonatal environment
A few infants will be considered ______ for either short-term
or long-term problems because of genetic defects, prenatal
hazards, or perinatal damage. It is essential to these infants’
survival and well-being that they be identified as early as possible
at risk
which provides a quick assessment of the newborn’s heart rate,
respiration, color, muscle tone, and reflexes
Apgar test,
have an LBW
(less than 2,500
grams, or 5½ pounds)
- age of mother (very young or older)
*low socioeconomic status of the mother, linked with poor nutrition
and inadequate prenatal care - race: black women are twice as likely as white women to experience premature delivery
*prior premature deliveries, which may indicate underlying and
persistent health conditions
*tobacco or alcohol use
tress
* pregnancies with more than one fetus (twins, triplets, etc.)
*infections
*high blood pressure
causes for lbw
, a substance that prevents the air sacs
of the lungs from sticking together and therefore aids breathing.
surfactant
why are respiratory difficulties are likely in premies because….
babies have not yet produced enough surfacant
_______ resting on a
parent’s chest helps maintain body temperature, heart rate, and
oxygen levels in the blood
kangaroo care
One-third of the children classified as at-risk showed considerable resilience, getting themselves back on a normal course
of development
The effects of prenatal and perinatal complications decrease
over time.
The outcomes of early risk depend on the quality of the postnatal environment.
Personal resources. Possibly because of their genetic makeup,
some children have qualities such as intelligence, sociability,
and communication skills that help them choose or create more
nurturing and stimulating environments and cope with challenges. For example, parents and other observers noted that these
children were agreeable, cheerful, and self-confident as infants,
which elicited positive caregiving responses. They also believed
that they were in control of their own fates—that through their
actions, they could bring about positive outcomes.
Supportive postnatal environment. Some at-risk children receive
the social support they need within or outside the family. Most
importantly, they are able to find at least one person who loves
them unconditionally and with whom they feel secure.
Clearly, hazards during the important prenatal and perinatal periods can leave lasting scars, and yet many children show remarkable resilience. There seem to be some points in the life span,
especially early on, in which both positive and negative environmental forces have especially strong effects. Yet environment
matters throughout life. It would be a mistake to assume that all
children who have problems at birth are doomed. In short, early
experience by itself can, but rarely does, make or break development; later experience counts, too, sometimes enough to turn
around a negative course of development
influences that
prevent the damaging effects of risk factors or help children overcome disadvantages
an inherited
digestive problem in which gluten (the proteins
found in all wheat products) triggers an immune
response that leads to inflammation and damages the small intestine
celiac disease
This _____after a period
of malnutrition or illness reflects the body’s
struggle to get back on the growth course it is
genetically programmed to follow.
catch-up
growth.
secrete chemicals called
hormones directly into the bloodstream.
endocrine glands
most critical of the endocrine glands is the
pituitary gland
definition: so-called master gland located at the
base of the brain. Directly controlled by the hypothalamus of the
brain, it triggers the release of hormones from all other endocrine
glands by sending hormonal messages to those glands.
pituitary gland
Moreover, the pituitary produces _____ hormone,
growth
the production of specialized hormones that directly regulate
growth
the growth hormone
secrete large quantities of testosterone and other male hormones
androgens
the primary female
hormone,
estrogen,
2nd defin Regulates growth from birth through adolescence; triggers adolescent growth spurt
Pituitary
Thyroid produce…
Thyroxine
which endocrine gland: Affects the growth and development of the brain and helps regulate the growth of the body during
childhood
Thyroid
Testes produce…
Testosterone
which endocrine gland: Develops the male reproductive system during the prenatal period; directs male sexual
development during adolescence
testes
Ovaries produce…
Estrogen and progesterone
which endocrine system: Regulate the menstrual cycle; estrogen directs female sexual development during
adolescence; progesterone allows conception and supports pregnancy
ovaries
Adrenal glands produce…
Adrenal androgens
Support the development of muscle and bones; contribute to sexual motivation
adrenal glands
Its basic unit is a
neuron
The axon of one neuron
makes a connection with another neuron at a tiny gap called a ____
synapse
—neurons becoming encased in this protective substance that speeds
transmission
myelination
according to which principle does growth occurs in a head-to-tail
direction
cephalocaudal
principle
This _______ of growth can
be seen during the prenatal period, when the chest and internal
organs form before the arms, hands, and fingers
proximodistal principle
removal of unnecessary synapses that is also an important component of brain development.
synaptic pruning
______ or growth of
synapses, during childhood
synaptogenesis
when is the critical, or sensitive, period for brain
development—the time when it proceeds most rapidly—
is during the late prenatal period and early infancy.
is an unlearned and involuntary response to a stimulus
reflex
its significance is that it provides oxygen; and expels carbon dioxide
Breathing
Theses are all_____reflexes
- breathing reflex
- pupillary reflex
- rooting reflex
- sucking reflex
- swallowing reflex
survival reflexes
_____ Protects eyes from bright light or foreign
objects
Eye-blink
definition: Constriction of pupils to bright
light; dilation to dark or dimly lit surroundings
Pupillary reflex:
against bright light; adapts
visual system to low illumination
pupillary reflex
Orients child to breast or bottle
Rooting reflex:
definition: turning a cheek toward a tactile (touch) stimulus
rooting reflex
which of the survial reflexes are permanent?
breathing
eye- blink
Pupillary reflex
swallowing
which survival reflexes are not permanent
sucking reflex and rooting reflex
: Fanning then curling toes when
bottom of foot is stroked
Babinski reflex
Curling fingers around objects (such as a finger) that touch the baby’s palm
Grasping reflex:
Loud noise or sudden change in position of baby’s head will cause baby to throw
arms outward, arch back, then bring arms
toward each other
Moro reflex:
Infant immersed in water will
display active movements of arms and legs and
will involuntarily hold breath (thus staying afloat
for some time)
Swimming reflex
: Infants held upright so that
their feet touch a flat surface will step as if to
walk
Stepping reflex
these are all which reflexes
Babinski:
Stepping reflex
Swimming reflex
Moro reflex
Grasping reflex
Babinski reflex
primitive reflexes
significance of: Presence at birth and disappearance in
first-year indicates normal neurological
development
Babinski
weakens by four months and is replaced by voluntary grasping
grasping reflex
Disappears by 4 months; however, child
continues to react to unexpected noises or a loss
of bodily support by showing startle reflex
moro reflex
which primitive reflex Disappears by 12–18 months months
babinski reflex
which a primitive reflex: Disappears in first 3–4 months; is replaced by a
voluntary grasp
grasping relfex
which primitive reflexes :Disappears by 4 months; however, child
continues to react to unexpected noises or a loss
of bodily support by showing startle reflex
Moro reflex
Disappears in first 4–6 months
swimming reflex
which reflex in the primitive: Disappears in first 8 weeks unless infant has
regular opportunities to practice it
Stepping refle
(for the rapid eye movements that occur
during it)
REM sleep
or asymmetry and specialization of functions,
of the two hemispheres of the cerebral cortex.
lateralization,
Which hemisphere: Sequential processing
Analytic thought
Logic
Language
Science and m
left-hemisphere functions
Which hemisphere: Simultaneous processing
Holistic thought
Intuition
Creativity
Art and music
Right-hemisphere functions
which is a combination of risk factors typically associated with
obesity and includes
high blood pressure
metabolic
syndrome (MeTS)
—high levels
of sugar in the blood
leading to various
health problems
diabetes
being 20% or more above the “ideal” weight for
height, age, and sex—is increasing.
obesity—