Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
T/F The division in cleavage of the zygote result in cell growth.
|
FALSE; these divisions DO NOT result in cell growth
|
|
|
With cleavage of the zygote, what happens to the cell volume?
|
The cell volume decreases
|
|
|
How does cleavage of the zygote occur initially?
|
initially synchronously, late occurs asynchronously
|
|
|
What is the result of cleavage of the zygote?
|
the result is dividing the large egg into many smaller daughter cells, called blastomeres
|
|
|
Through what process does the embryo remain enclosed in the zona pellucida
|
cleavage of the zygote
|
|
|
What is the cleavage process?
|
1) divides the daughter cells in two
2) Four equal blastomeres-40 hours 3) By day 3, there are 6-12 cells 4) By day 4, 16-32 cells called a morula |
|
|
What does the cells of the morula give rise to ?
|
1) the embryo proper with its extraembryonic membranes
2) the placenta and its related structures |
|
|
Formation of the blastocyst
|
1) First divides the daughter cells in two
2) second four equal blastomeres (40 hours) 3) By day 3, there are 6-12 cells 4) By day 4, 16-32 cells called a morula. 5) Embryoblast-inner cell mass; this forms entire embryo 6) trophoblast- forms the placenta and placental membranes 7) Blastoceol Forms-cavity formed by compaction, and filled with fluid |
|
|
allow electrically couple cells of epithelium surrounding a fluid-filled cavity
|
gap junctions
|
|
|
close to outer surface create a seal, isolates interior embryo from external medium
|
tight junctions
|
|
|
by day 4, the morula begins to do what?
|
absorb fluid
|
|
|
cells become more concave and reorganize in what?
|
compaction
|
|
|
during compaction blastomeres move into the center of what?
|
the morula
|
