30 Questions
How long does each mitotic division take in the early embryo development?
24 hours
What is the stage called when the borders of the blastomeres become invisible with each other and they are connected to each other?
Compaction stage
How many cells are present in the blastocyst stage?
200-500 cells
What is the first cellular differentiation that occurs in the early embryo development?
First cellular differentiation occurs at the early blastocyst stage
How long after fertilization does the first cleavage occur?
24 hours
What is the term used to describe the cells produced by the cleavage process in the early embryo development?
Blastomeres
What is the outermost layer of the uterus called?
Perimetrium
Which phase of the menstrual cycle sees the thickening of the endometrium?
Follicular phase
When does uterine receptivity finish during the menstrual cycle?
20-24th day
What factors affect implantation?
Quality of the embryo
What happens if implantation does not occur during the menstrual cycle?
Menstruation occurs
In which phase does implantation occur?
Secretory phase
What is the primary function of the zona pellucida during early embryonic development?
To protect the embryo from the uterine environment
What is the term used to describe the process of the embryo emerging from the zona pellucida?
Hatching
What is the term used to describe the cavity within the blastocyst that is filled with fluid?
Blastocoele
Which of the following cell masses will eventually form the embryo?
Inner cell mass (ICM)
What is the term used to describe the cells in the blastocyst stage that can no longer transform into another cell type?
Pluripotent cells
Where does the implantation of the blastocyst typically occur within the uterus?
Posterior wall of the endometrium, close to the fundus
What is the duration of the implantation window?
6-10 days after ovulation
Which of the following factors affect endometrial receptivity and the implantation window?
Cytokines (IL-1β and IL-1α), β-HCG, and signaling mechanisms produced by the blastocyst
What is the first stage of implantation?
Apposition
What happens during the decidual reaction after the first attachment?
The endometrium undergoes changes, and decidua cells begin to synthesize and store lipid and glycogen
What happens during the penetration stage of implantation?
The blastocyst starts to secrete enzymes to break down the endometrium
What happens during the invasion stage of implantation?
The blastocyst becomes fully embedded in the endometrium
What is the function of the cytotrophoblast cells?
To form the syncytiotrophoblast layer
What is the bilaminar embryonic disc composed of?
Epiblast and hypoblast
Which layer of cells appears first on the surface of the embryoblast, facing the blastocyst cavity?
Hypoblast
What is the primary cause of multiple pregnancy?
Ovulation and fertilization of multiple oocytes
In the case of a monozygotic multiple pregnancy, how are the embryos related?
They have the same genetic material and are identical
How are dizygotic multiple pregnancies different from monozygotic ones?
They carry different genetic material
Explore the key events during the 2nd week of development and implantation in embryos. Learn about mitotic divisions, compaction stage, blastocyst formation, and more.
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