Fertilization and Implantation

Question 1

What is the first stage of embyrogenesis

Answer 1

cleavage

Question 2

what does zygote produce during cleavage

Answer 2

morula

Question 3

when does first cell division occur

Answer 3

36 hours after fertilization

Question 4

what comes after morula

Answer 4

blastula

Question 5

what does a trophoblast become

Answer 5

chorion

Question 6

what is chorion

Answer 6

zygote contribution to placenta

Question 7

what becomes the embryo

Answer 7

inner cell mass after formation of trophoblast

Question 8

Embryogenesis steps

Answer 8

cleavage, morula, blastocyst, trophoblast, embryo

Question 9

when does blastocyst implant in uterus

Answer 9

week after fertilization

Question 10

what does blastocyst consist of

Answer 10

trophoblast and embryo

Question 11

what is trophoblast

Answer 11

ring of cells on blastocyst surrounding a cavity

Question 12

when is hCG essential for maintenance of endometrium

Answer 12

first trimester or three months until placenta develops

Question 13

what is role of hCG

Answer 13

substitute for LH in maintaining corpus luteum

Question 14

what is role of corpus luteum

Answer 14

maintain endometrium

Question 15

amnion

Answer 15

fluid filled cavity containing embryo

Question 16

yolk sac

Answer 16

first site of rbc synthesis in developing embryo

Question 17

allantois

Answer 17

develops from embryonic gut and forms the blood vessels of the umbilical cord

Question 18

function of umbilical cord

Answer 18

transport blood between embryo and placenta

Question 19

amnion, yolk sac, and allantois come from where

Answer 19

inner cell mass of blastula

Question 20

gastrulation

Answer 20

when the three primary germ layers become distinct

Question 21

what are the three primary germ layers

Answer 21

ectoderm, mesoderm, and endoderm

Question 22

Endoderm

Answer 22

inner layer

Question 23

Ectoderm

Answer 23

outer layer

Question 24

Mesoderm

Answer 24

develops from endoderm

Question 25

blastopore gives rise to which structure

Answer 25

anus

Question 26

The ectoderm forms which structures

Answer 26

entire nervous system, cornea and lens, epidermis, nasal, oral, and anal epithelium

Question 27

endoderm forms which structures

Answer 27

gi tract epithelium, liver, pancreas, respiratory epithelium, urinary bladder, epithelial lining of urogenital organs and ducts

Question 28

mesoderm structures

Answer 28

muscle, bone, and connective tissue. cardiovascular system, lymphatic system, kidneys, blood, ureters, gonads, reproductive ducts, dermis of skin

Question 29

what comes after gastrulation

Answer 29

neuralation

Question 30

neuralation

Answer 30

formation of nervous system

Question 31

when does neuraltion occur

Answer 31

when ectoderm differentiates into neural plate

Question 32

When are all major organ systems present

Answer 32

8 weeks embryo is now fetus

Question 33

during which trimester are organs being formed

Answer 33

first trimester