16 Questions
During weeks 14-16 of fetal development, which substances can cross the placenta through simple diffusion?
O2, CO2, and other gases
When does sexual differentiation typically begin?
Weeks 9-12
What happens to the blood in the heart during weeks 9-12?
It flows through the foramen ovale and ductus arteriosus
During weeks 13-16, what can be observed in the fetus?
Movements becoming more powerful and sebaceous glands coating the skin with vernix caseosa
What is the effect of estrogen on the mother during pregnancy?
It helps fetal development and stimulates maternal tissue growth
Which hormone stimulates the growth of mammary glands?
Prolactin
What is the result of the fusion of sperm and oocyte nuclei during fertilization?
A cell with half genetic material from each parent
What is the primary function of the acrosomal reaction during fertilization?
To release enzymes to penetrate the corona radiata and zona pellucida
What is the term for the first two weeks of development after fertilization?
Pre-embryonic stage
What is the primary function of the placenta during embryonic development?
To provide nourishment to the embryo
What is the term for the indentation that forms during week 3 of embryogenesis, allowing cells to travel along and form endoderm or mesoderm?
Primitive streak
What is the result of the fusion of maternal and embryonic tissues during placenta development?
A functional placenta
What is the term for the fluid-filled sac that surrounds the embryo and provides protection?
Amnion
What is the percentage of blastocysts that fail to implant in the uterine wall?
50%-75%
What is the term for the type of twins that form when a single fertilized egg splits in two?
Identical twins
When is the placenta fully developed and functional?
By the end of week 12
Learn about the process of fertilization, from the journey of sperm to the formation of a zygote. Discover how millions of sperm are killed due to acidity and blocked by cervical mucus, and what happens to the surviving sperm during fertilization.
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