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level: Implantation

Questions and Answers List

level questions: Implantation

QuestionAnswer
The oogonium becomes...enclosed within the secondary oocyte where it then becomes ovulated by sperm
What occurs to the secondary oocyte after it undergoes ovulation?the oocyte undergoes meiosis II and thus produces and ovum
What begins implantation?The blastocyst begins implantation
When does implantation begin?Implantation begins about 6 days after conception
What structure grows into the blastocyst?the maternal blood vessels grow into the blastocyst structure
What does a blastocyst contain?- an inner cell mass - outer trophoblast
What are the 2 layers the trophoblast forms into?1. cytrophoblast (inner layer) 2. Syncytiotrophoblast (outer layer)
Name the structureTrophoblast
Name the structureBlastocyst cavity
Name the structureInner cell mass
Name the structureUterine endometrial epithelium
Name the structureEndometrium
Name the structureLumen of Uterus
Name the structureSyncytiotrophoblast
Name the structureCytotrophoblast
What is ocurring in this photo?the blastocyst begins to implant into the uterus lining the endometrium
How does the placenta form?the blastocyst gives rise to finger like outgrowths called chorionic villi that interdigitate into depressions called crypts in the wall of uterus
Name the structureUterus
Name the structuresAmnion and amnionic cavity
How is the fetus recieving its nutrion durng week 4though the umbilical vessels that connect it to the placenta
Name the structureDecidua capsularis
Name the structureMaternal blood
What are the 2 parts of the placenta?the fetal placenta and the maternal placenta
What is the function of the placenta?The placenta engages in exchange across the chorionic villi between maternal and fetal blood - provides fetus with nutrients and oxygen - Disposes of waste - allows hormonal signals to be sent to the mother
When is the placenta fully formed?By week 13 the placenta is fully formed
What does the placental barrier consist of?The placental barrier consist of all three layers of the chorionic villi
What diffuses across the placenta from the mother to the fetus?sugars, fats, and oxygen diffuse from the mother to fetus
What diffuses across the placenta from the fetus to the motherUrea and carbon dioxide diffuse from the fetus to the mother
What else is transported across the placenta?Maternal antibodies, viruses, alcohol, and heroin cross the placental barrier
Name the structureDecidua Basalis
Name the structureChorionic villi
Name the structureDecidua Capsularis
Name the structureBasal layer of endometrium
Name the structureDecidus Basalis which is the maternal portion of the placenta
Name the structureChorion which is the fetal portion of the placenta
Name the structureChorionic villus which contains fetal capillaries
Name the structureUmbilical cord which contains the umbilical arteries and veins as well
Name the structure and what the structure contains?Zygote; the zygote contains chromosomes from male and female gametes