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Questions and Answers
What is the primary focus of the second week of human development?
What is the primary focus of the second week of human development?
- Implantation of the blastocyst (correct)
- Development of the placenta
- Cleavage of the zygote
- Formation of the morula
Which term describes the solid sphere of cells formed at around sixteen divisions of the zygote?
Which term describes the solid sphere of cells formed at around sixteen divisions of the zygote?
- Trophoblast
- Embryoblast
- Blastocyst
- Morula (correct)
What triggers the formation of the blastocole within the developing embryo?
What triggers the formation of the blastocole within the developing embryo?
- Fusion of the morula cells
- Expansion of the trophoblast layer
- Absorption of nutrients from the uterine wall
- Fluids penetrating the zona pellucida (correct)
During which phase does the blastocyst establish weak interactions with the uterine wall?
During which phase does the blastocyst establish weak interactions with the uterine wall?
What happens to the zona pellucida once the blastocyst enters the uterus?
What happens to the zona pellucida once the blastocyst enters the uterus?
How frequently does cleavage division occur after the zygote's first division?
How frequently does cleavage division occur after the zygote's first division?
What is the ultimate purpose of implantation during the second week of development?
What is the ultimate purpose of implantation during the second week of development?
What term refers to the inner cell mass of the blastocyst that will develop into the embryo?
What term refers to the inner cell mass of the blastocyst that will develop into the embryo?
What structure does the inner cell mass of the blastocyst ultimately develop into?
What structure does the inner cell mass of the blastocyst ultimately develop into?
What are the two sub-layers that the trophoblast develops into?
What are the two sub-layers that the trophoblast develops into?
What is the primary function of human chorionic gonadotropin produced by the syncytiotrophoblast?
What is the primary function of human chorionic gonadotropin produced by the syncytiotrophoblast?
During which stage does the syncytiotrophoblast create vacuoles filled with blood?
During which stage does the syncytiotrophoblast create vacuoles filled with blood?
What is the role of progesterone in the early stages of embryo development?
What is the role of progesterone in the early stages of embryo development?
What forms the bilaminar disc during blastocyst development?
What forms the bilaminar disc during blastocyst development?
What triggers the endometrial lining to become thickened and vascularized after ovulation?
What triggers the endometrial lining to become thickened and vascularized after ovulation?
What mechanism allows the blastocyst to hatch from the zona pellucida?
What mechanism allows the blastocyst to hatch from the zona pellucida?
Study Notes
Second Week of Development
- The second week of human development focuses on implantation and differentiation of the blastocyst.
- The morula forms from the zygote after rapid cell division.
- The morula develops into a blastocyst.
- The blastocyst contains the inner cell mass (ICM) which forms the embryo and outer cells called the trophoblast.
Implantation
- Implantation happens within the uterus.
- The blastocyst attaches to the endometrial lining.
- The zona pellucida degenerates, exposing the trophoblast.
- The trophoblast interacts with the uterine wall.
- There are three phases of implantation: apposition, attachment, and invasion.
Blastulation (Blastocyst Formation)
- The trophoblast differentiates into two sub-layers: cytotrophoblast and syncytiotrophoblast.
- The embryoblast differentiates into two layers: epiblast and hypoblast.
- The amniotic cavity and yolk sac develop around the bilaminar disc.
- The syncytiotrophoblast invades the maternal capillaries, creating uteroplacental circulation.
Placenta Development
- The syncytiotrophoblast produces human chorionic gonadotropin (hCG).
- hCG supports the corpus luteum, which produces progesterone.
- Progesterone thickens the endometrial lining for the embryo.
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Description
Explore the crucial processes during the second week of human development, including implantation and blastocyst formation. This quiz covers the transition from zygote to morula, and the subsequent stages of implantation involving the trophoblast and endometrial interaction.
