exam 4-lp7 Flashcards
(130 cards)
Fertilization
fuses/makes
how does penetration happen
when take pregnancy test
who determines gender
Fetal Development
sperm fuses to ovum and makes zygote
all sperm surround ovum, only one will penetrate
women can take pregnancy test after first missed period to see HCG
males determine gender
fertilization-fetal development
how long is ovum fertile
how long is sperm fertile
how long for implantation
ovum is fertile for 24 hrs after release from fallopian tubes
sperm is viable in female tract from 48-72 hrs
takes 8-10 days for implantation
how are
paternal
identical
twins made
faternal twins are two separate ovum and 2 separate sperm
identical are one sperm and ovum that randomly divide
Functions of Amniotic Fluid
constantly
absorbed/back
once kidney
filled
Fetal Development
constantly changing as baby swallows fluid
absorbed into fetal blood stream and back into placenta into moms bloodstream
once kidneys develop urine will develop
cushy water filled sac
Amniotic fluid will protects from what
regulates
allows
helps w/
Functions of Amniotic Fluid
amniotic fluid will protect baby from pressure/blows from moms abdomen
regulate temperature
allows for movements
helps with umbilical cord
normal amniotic fluid–how much
hydramnios/ Polyhydramnios-how much
Oligohydramnios–how much
normal is 800-1200 mls of amniotic fluid
poly- over 2000 mls of amniotic fluid
oligo- less then 400 mls of amniotic fluid
Umbilical Cord
of arteries and veins
arteries do what
viens do what
AVA” 2 Arteries and 1 Vein
Arteries carry unoxygenated blood AWAY from fetus
Vein carries oxygenated blood TO fetus
Development and Functions of the Placenta
when start
place where
exchange, function–main functions
functions like
functions start at 3-4 weeks
Place where nutrient and metabolic exchange takes place.
gas exchange, nutrition, excerction and endocrine function
Functions like the fetal lungs
4 weeks
8 weeks
8-12 weeks
16-20 weeks
24 weeks
Important Milestones in Development
4 weeks: heart is formed
8 weeks: organs formed; facial features discernable
8-12 weeks: fetal heart rate heard with Doppler
16-20 weeks: fetal movements felt by mother
24 weeks: fetal respiratory movements begin;
low-end age of viability
Fetal Circulation
bypasses
most blood bypasses lungs because gas exchange occurs in placenta
How does fetal circulation differ
lungs in mom
lungs in birth
3 shunts
Fetal lungs are fluid filled while in mom
as baby is born fluid leaves lungs
3 shunts-
Ductus venosus
Foramen Ovale
Ductus Arteriosis
Ductus venosus
allow
Allows blood to bypass liver and go to inferior vena cava
Foramen Ovale
allows
Allows blood to pass from right atrium to left atrium
Ductus Arteriosis
allows
Allows blood to pass from pulmonary artery to aorta.
why will shunts close
allows for
close due to cold air
allow for start of respiratory circulation
-Intrauterine Factors-
fetal lung development-surfactant
surf develops/peaks
if premature
Fetal lung development-surfactant -helps with expansion
surfactant develops at 24 weeks/peaks 35
if premature might give surfactant shot to build up lungs
Respiratory Adaptations
abnormalities
shunts
Newborn Physiologic Responses
Respiratory Adaptations are the most important part to watch for
any abnormalities follow up on
shunts should close to stimulate breathing
Mechanical events
TS
comes out
pressure
Initiation of breathing
Newborn Physiologic Responses Respiratory Adaptations
-thoracic squeeze.
when baby comes out vaginal canal, fluid is squeezes out lungs
and pressure changes causes breath and expansion
Chemical stimuli
decrease
no longer
Initiation of breathing
Newborn Physiologic Responses Respiratory Adaptations
decrease of placental exchange
placenta will not longer breath for baby
Thermal stimuli
what prompts
stimulates
Initiation of breathing
Newborn Physiologic Responses Respiratory Adaptations
coldness prompts baby to take deep breathes
cold air stimulates crying
Sensory stimuli
what stimulates
what do you want
Initiation of breathing
Newborn Physiologic Responses Respiratory Adaptations
lights
sounds
gravity
talking
rubbing
you want baby to scream and cry
Newborn Breathing
adjusting
What is normal
retractions
baby will have trouble adjusting to real world
normal-irregular patterns-30-60 bpm
retractions may be near clavicle and her bottoms of ribs
Signs of Respiratory Distress
retractions
cyanosis
nasal flaring
grunting
apnea-normal/abnormal
Retractions-pulling in and body is sucking itself in-caving in
Cyanosis-blueish color from not enough oxygen
Nasal flaring
–Obligatory nose breathers
Grunting-audibly hear
Periodic Breathing Pattern
–Apnea
—–Less than 20 secs with no cyanosis=normal
——-Greater than 20 seconds=abnormal
Feeding an infant in respiratory distress
could indicate
could indicate that a duct didn’t close properly