How tissues are made from cells

Question 1

what is a zygote

Answer 1

a fertilised egg

Question 2

what formes at the 32 cell stage

Answer 2

the morula is formed

Question 3

where do cell to cell junctions form?

Answer 3

in the morula

Question 4

what can we no longer see at the 32 cell stage

Answer 4

individual cells

Question 5

is the hypoblast primitive endoderm or primitive ectoderm

Answer 5

primitive endoderm

Question 6

is the epiblast primitive endoderm or primitive ectoderm

Answer 6

primitive ectoderm

Question 7

what does the inner cell mass split into

Answer 7

the epiblast cells and hypoblast

Question 8

how is the mesoderm formed

Answer 8

when cells from the epiblast migrate down to form the mesoderm

Question 9

how is the primitive streak formed

Answer 9

The primitive streak descends from a group of cells that form the primitive node.

Question 10

what makes up the amnion

Answer 10

Ectoderm + Mesoderm

Question 11

what makes up the chorion

Answer 11

Trophoblast + Mesoderm

Question 12

what makes up the yolk sac

Answer 12

Endoderm + Mesoderm

Question 13

what is the primitive streak

Answer 13

a region of forming mesoderm in

trilaminar disc stage.

Question 14

how does the tube of the primitive gut form

Answer 14

The trilaminar disc folds as it grows and develops so that the ectoderm completely
surrounds the body and the endoderm becomes the tube of the primitive gut

Question 15

the ectoderm and endoderm are epitheal

true or false

Answer 15

true

Question 16

Mesoderm doesnt have the looser structure of mesenchyme.

true or false

Answer 16

false. Mesoderm has the looser structure of mesenchyme.

Question 17

4 types of cells or tissues

Answer 17

Epithelial
Muscle
Nervous tissue
Connective Tissue

Question 18

what are somatic cells

Answer 18

the cells of the body

Question 19

what are germ cells and what is special about them?

Answer 19

Germ cells are the gametes – eggs and sperm

Germ cells generally cannot be changed by the body that bears them

Question 20

what is Hyaluronidase for

Answer 20

to digest through cumulus

Question 21

what are morula

Answer 21

– cell:cell junctions form, can no longer see individual cells

Question 22

how long is the cleavage cycle

Answer 22

24H

Question 23

concept of empbryo development

Answer 23

genetic material combined
increase cell number
geneone activated
cell to cell junction begin to form
then differentiation
prtotein synthasesis
Na/K atpase
true growth and prep for implantation

Question 24

what is a blastocyst

Answer 24

contains cavity

120-168h post fertilisation

Question 25

describe the bilaminar disc

Answer 25

Cells of the ICM split into two types – Epiblast cells and hypoblast cells. Epiblast cells are primitive ectoderm whereas hypoblast are primitive endoderm. This stage is known as the bilaminar disc

Question 26

desribe the folding

Answer 26

Blastocyst with epiblast and hypoblast
Mesoderm forms in between
Hypoblast begins to surround the inner face of the trophoblast and meets at the base
Mesoderm grows between hypoblast and trophoblast and between epiblast and trophoblast –cavities form
Cell layers divisible into embryonic ectoderm, mesoderm and endoderm, amniotic ectoderm/mesoderm and yolk sac
Trilaminar embryonic disc curls up; outer ectoderm surrounded by amniotic cavity, itself surrounding mesoderm which surrounds endoderm