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Questions and Answers
What is the role of acrosine in the fertilization process?
What is the role of acrosine in the fertilization process?
- It is responsible for the cortical reaction in the oocyte.
- It modifies the extracellular matrix of the egg to make it impenetrable to sperm entry.
- It helps the sperm to pass through the zona pellucida. (correct)
- It is involved in the fusion of the sperm and oocyte cell membranes.
What is the purpose of the zona reaction during fertilization?
What is the purpose of the zona reaction during fertilization?
- It prevents the binding of another sperm to ZP3 in the zona pellucida. (correct)
- It causes the sperm binding activity of ZP3 to be lost.
- It creates a fast blockage to polyspermy by modifying the extracellular matrix.
- It releases cortical granules to the perivitellin space to avoid polyspermy.
What is the first answer of the oocyte to the incoming sperm?
What is the first answer of the oocyte to the incoming sperm?
- The release of cortical granules.
- The cortical reaction. (correct)
- The zona reaction.
- The fusion of the oolemma with the sperm.
What is the role of the cortical granules in the fertilization process?
What is the role of the cortical granules in the fertilization process?
What is the structure of the sperm that interacts with the oolemma (egg cell membrane) during fertilization?
What is the structure of the sperm that interacts with the oolemma (egg cell membrane) during fertilization?
What is the stage of meiosis that oocytes are arrested in before puberty?
What is the stage of meiosis that oocytes are arrested in before puberty?
When can the pupillary light reflex in the eye be determined?
When can the pupillary light reflex in the eye be determined?
What is the approximate amount of white fat in the fetus between weeks 30 and 34?
What is the approximate amount of white fat in the fetus between weeks 30 and 34?
What is the typical weight of a normal fetus at birth?
What is the typical weight of a normal fetus at birth?
When are gender characteristics of the fetus evident?
When are gender characteristics of the fetus evident?
What percentage of babies are born 1 or 2 weeks after the expected due date?
What percentage of babies are born 1 or 2 weeks after the expected due date?
Which factor can lead to babies with intrauterine growth restriction (IUGR) or small for gestational age (SGA)?
Which factor can lead to babies with intrauterine growth restriction (IUGR) or small for gestational age (SGA)?
Which type of cells differentiate to become syncytiotrophoblast during implantation?
Which type of cells differentiate to become syncytiotrophoblast during implantation?
What is the name given to the layer of cells that first appears on the surface of the embryoblast at the end of the first week?
What is the name given to the layer of cells that first appears on the surface of the embryoblast at the end of the first week?
What type of pregnancy occurs when more than one oocyte is ovulated and fertilized in the same cycle?
What type of pregnancy occurs when more than one oocyte is ovulated and fertilized in the same cycle?
What gives rise to germ layers that form all the tissues and organs of the embryo?
What gives rise to germ layers that form all the tissues and organs of the embryo?
What is the primary function of the yolk sac during early gestation?
What is the primary function of the yolk sac during early gestation?
What occurs when a single zygote splits into two in the early stages of division forming two different embryos?
What occurs when a single zygote splits into two in the early stages of division forming two different embryos?
Which of the following fetal membranes develops from the EPIBLAST?
Which of the following fetal membranes develops from the EPIBLAST?
What is a bilaminar embryonic disc composed of during implantation?
What is a bilaminar embryonic disc composed of during implantation?
What is the connection between the yolk sac and the developing embryo?
What is the connection between the yolk sac and the developing embryo?
Which of the following is not considered a fetal membrane?
Which of the following is not considered a fetal membrane?
During which stage of embryogenesis do the yolk sac and amnion develop?
During which stage of embryogenesis do the yolk sac and amnion develop?
Which of the following is not an extaembryonic fetal membrane?
Which of the following is not an extaembryonic fetal membrane?
At what stage of development does ossification (bone formation) begin in the upper extremities?
At what stage of development does ossification (bone formation) begin in the upper extremities?
Which of the following is true about the fingers during the 7th week of development?
Which of the following is true about the fingers during the 7th week of development?
At what point does the connection between the primitive gut and the umbilical sac decrease?
At what point does the connection between the primitive gut and the umbilical sac decrease?
When does voluntary movement of the extremities first appear?
When does voluntary movement of the extremities first appear?
Which structure disappears completely by the end of the 8th week of development?
Which structure disappears completely by the end of the 8th week of development?
What happens to the eyes by the end of the 8th week?
What happens to the eyes by the end of the 8th week?
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