REI

Question 1

stage at 3 days after fertilization

Answer 1

embryo is at cleavage stage

Question 2

stage at 4 days after fertilization

Answer 2

morula

Question 3

stage at 5 days after fertilization

Answer 3

blastulation, and appears in the uterus but not implanted

Question 4

stage at 7 days after fertilization

Answer 4

blastocyst implants into uterine wall

Question 5

stage at 12 days after fertilization

Answer 5

embryo has embedded and begins interacting with maternal circulation

Question 6

steps of pregnancy implantation

Answer 6

apposition > adhesion > invasion