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8 Cards in this Set

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Describe the processes of fertilization and implantation.
The sperm that reach the egg secrete enzymes to penetrate the egg. Once one sperm has entered the egg, the electrical charge of the egg’s membrane changes and prevents other sperm from entering. The zygote divides many times, and the blastocyst implants in the uterine lining six days after fertilization.
What is the function of the placenta?
nutrient and waste exchange between the mother’s and embryo’s blood
What is the function of the umbilical cord?
The umbilical cord contains fetal blood vessels, which bring nutrients and oxygen to the fetus and return waste products back to the mother’s blood
Why is an embryo most vulnerable to drugs and other harmful substances taken by its mother when it is between two and seven weeks old?
This is when all body systems are forming
Compare the functions of human embryonic membranes with those inside a bird's egg.
both protect the developing embryo and allow for the exchange of materials
in females, the attachment of a blastocyst to the lining of the uterus.
implantation
Prepare a table listing the events in the three trimesters of pregnancy.
1)First trimester: organ systems start forming; partially formed heart begins beating. External sex organs become apparent. 2)Second trimester: heart is fully formed; size increases; bones harden and fetus begins to move, eyes open 3)Third trimester: Growth continues; fetus moves freely;
ropelike structure that attaches the embryo to the wall of the uterus; supplies a developing embryo with oxygen and nutrients and removes waste products.
umbilical cord