Chap 3 N 15 Flashcards
(36 cards)
mitosis
Growth and repair
Miosis
sex cells and fertilization
Fertilization
when sperm and ovum meet
how long does sperm live
5 days
who determines sex of baby
male/father
Zygote
formed by union of sperm and ovum, undergoes mitosis division
morula
right b4 inplantation. enters uterus on 3rd day
stages of the egg in order
fertilizatuon, zygote, morula, blastocyst-attaching to wall
chorion
envelopes amnion,embryo and yolk sac. thick wall has villi
amnion
envelopes n protects embryo
amniotic sac formed by…
Chorion n amnion filled with water
5 functions of amniotic fluid
maintain temp prevent sac from sticking to baby allows symmetrical growth of fetus allows buoyancy n fetal movement acts as cushion to protect fetus
what are 3 germ layers
endoderm
ectoderm
mesoderm
ectoderm
outer layer of skin
oil glands n hair follicles
mesoderm
true skin middle layer skeleton bone n cartilage muscle
endoderm
inner layer
lines trachea, pharynx, n bronchi
lines digestive tract
3 stages of prenatal development
zygote, embryo, fetus (9wks)
placenta
produces 4 hormones
progesterone,estrogen, hgc, hpl (human placental lactogen)
placental transfer
AVA
Artery Vein Artery
progesterone
maintains uterine lining-helps aids in male fetus development
estrogen
stimulated uterine growth, increase blood flow, aids in female fetus development
human placental lactogen
hPL- glucose avail to baby as it grows
umbilical cord
A.v.a
arteries carry blood
vein returns blood
anticipatory guidance
goves you a heads up on what to expect with child development
ex. potty training-bring extra clothes