Ebryology 1

Question 1

during what weeks does the pre embryonic phase take place

Answer 1

0-3 weeks

Question 2

during what weeks does the embryonic phase take place

Answer 2

4-8 weeks

Question 3

each sperm and ovum is genetically unique true or false

Answer 3

true

Question 4

is a zygote a diploid or haploid cell

Answer 4

diploid

Question 5

what is formed between the stages of a zygote and a blastocyte

Answer 5

morula

Question 6

After the morula what is formed

Answer 6

blastocyte

Question 7

what is the morula

Answer 7

a solid mass of cells

Question 8

why does a blastocytic cavity form in the morula

Answer 8

as the number and size of cells increase, getting nutrition to the central core of the cells becomes difficult therefore the cavity forms to aid the process

Question 9

what is the outer lining of cells of the morula called

Answer 9

trophoblast

Question 10

what is an ectopic pregnancy

Answer 10

a pregnancy in which the fetus develops outside the womb, typically in a fallopian tube.

Question 11

at what week does the placenta begin to develop

Answer 11

week 2 of pre embryonic phase

Question 12

when does implantation occur (when the blastocyte begins to burrow into the uterine wall)l

Answer 12

at 7 days

Question 13

what are the cells that form the outer cell mass referred to as

Answer 13

trophoblast

Question 14

how many layers does the trophoblast divide to form

Answer 14

2

Question 15

what does the trophoblast ultimately form

Answer 15

the chorion

Question 16

what is the chorion and what is its function

Answer 16

it is a membrane that develops at the beginning of pregnancy between the fetus and the mother.
it is involved in the implantation process and forms part of the placenta.

Question 17

what does the chorion secrete that can be used to detect pregnancy

Answer 17

human chorionic gonadotrophin

Question 18

what is the decidua basalis

Answer 18

part of the endometrium deep to the implanted conceptus

Question 19

human chorionic gondaptropin helps to maintain what

Answer 19

the endometrium

Question 20

what happens to the inner cell mass of the blastocyte

Answer 20

form a 2 layered flat disc called the bilaminar disc

Question 21

the bilminar disc separates 2 cavities, what are these cavities

Answer 21

amniotic cavity

yolk sac

Question 22

around what week does the bilaminar disk form

Answer 22

second week

Question 23

by what week is the placenta mature

Answer 23

by 18-20 weeks