16 Questions
Which of the following substances cross the placenta through simple diffusion?
O2 and CO2
During which weeks does the placenta take over the endocrine function from the corpus luteum?
Weeks 12-17
What is the primary function of relaxin during pregnancy?
Loosening the pelvis and dilating the cervix
What is the effect of increased estrogen levels during pregnancy?
Stimulating maternal tissue growth
During which weeks does the fetal heart shift blood through the foramen ovale and the ductus arteriosus?
Weeks 9-12
What is the primary function of hCG during pregnancy?
Stimulating male gonads to produce testosterone
What is the result of fertilization?
The formation of a zygote with half genetic material from each parent
What percentage of sperm are killed due to acidity during fertilization?
Almost immediately
What is the purpose of capacitation?
To prepare the sperm for fertilization
What are the two layers that surround the oocyte?
Zona pellucida and corona radiata
What happens to the plasma membrane after fertilization?
It depolarizes to prevent more penetration
What is the result of the acrosomal reaction?
Enzymes are released to penetrate the corona radiata and zona pellucida
What is the gestation time for full fetal development?
Until birth
What is the purpose of the yolk sac?
To provide nourishment to the embryo until the placenta is functional
What is the result of implantation?
The blastocyst is implanted in the uterine wall
When is the placenta complete?
By the end of week 12
Learn about the journey of sperm and oocyte during fertilization, how they overcome obstacles, and eventually form a zygote. Discover the challenges faced by sperm, from acidity to phagocytic leukocytes, and how the surviving ones reach their destination.
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