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14 Cards in this Set
- Front
- Back
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While the ovum is traveling, the spot on the ovary from which it was released, now called the ____________, secretes hormones that prepare the lining of the uterus to receive a fertilized ovum. Id pregnancy does not occur, this shrinks, then is discarded two weeks later. |
Corpus lateum |
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During conception, the sperm lives up to _______ days and eggs lasts ____ hours. |
6, 24 |
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During pregnancy, ________ weeks are for conception and _________ weeks are for developing th baby. |
2 weeks and 38 weeks |
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The __________ period is two weeks long when the one-celled zygote multiples and forms a blastocyst which burrows into the uterine lining. |
Zygote |
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Between the seventh and ninth days, ______________ occurs: The blastocyst burrows deep into the uterine lining. Occurs at the end of zygotic period. |
Implantation |
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By the end of the second week, cells of trophoblast form another protective membrane - the _________, which surrounds the amnion. Tiny hairlike villi, or vessels, emerge. |
Chorion |
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By bringing the embryo's and mother's blood close together, the _________ permits food and oxygen to reach the organism and waste products to be carried away. |
Placenta |
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The placenta is connected to the developing organism by the ______________, which first appears as a tiny stalk and eventually grows to a length one to three feet. This also delivers blood loaded with nutrients and two arteries that remove waste products. |
Umbilical cord |
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The period of the ____________ lasts from implantation through the eighth week of pregnancy. During these brief six weeks, the most rapid prenatal changes take place as the groundwork is laid for all body structures and internal organs. |
Embryo |
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The period of the _____, from ninth week to the end of pregnancy, is the longest prenatal period. Growth is rapid |
Fetus |
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Prenatal development is sometimes divided into _______________ or three equal time periods. |
Trimester |
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In the second trimester, a cheeselike substance called _____________ protects its skin from chapping during the long months spent bathing in the amniotic fluid. |
Vernix |
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White, downy hair called ____________ also appears over the entire body, helping the vernix stick to the skin. |
Lanugo |
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During the final trimester, a fetus born early has a chance for survival. The point at which the fetus can first survive, called the ___________, occurs sometime between 22 and 26 weeks. |
Age of viability |
