Stages of Human Development Flashcards
1
Q
the unfertilized egg is activated by fusion with the sperm in the Fallopian tube
A
fertilization
2
Q
the zygote cleaves by mitosis as it moves down the uterus
A
cleavage
3
Q
the embryo forms a hallow ball and 3-6 days after fertilization becomes implanted in the uterus
A
blastulation
4
Q
the placenta forms around 2 week old embryo
A
gastrulation
5
Q
the one month old embryo is 1/2 cm in size, forms body organs
A
organogenesis
6
Q
th embryo, now 2 months, shows miniature limbs as hands, arms, elbows, legs, knees
A
continued morphogenesis
7
Q
the fetus, now 3 months, has completed organs
A
end of 1st trimester
8
Q
there is a heartbeat detected, fine body hairs, the fetuses is 1 foot long and 2 1/4 pounds
A
2nd tri
9
Q
there is a period of growth, the fetus reaches 6-9 pounds
A
3rd tri
10
Q
sunod sunod!
A
fertilization cleavage blastulation gastrulation neurulation organogenesis continued morphogenesis end of 1st trimester 2nd trimester 3rd trimester
