Term
| Explain the difference between calculating weeks based on LMP versus fertilization. |
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Definition
| LMP is last menstrual period and calculations using it include roughly two weeks before the ovum is fertilized and conception occurs. When studying fetal development, it is important to note which calculation is being used. (V 556) |
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Term
| The fusion of the ovum and sperm create a single cell called a |
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Definition
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Term
| The pronucleus of ovum and sperm each contain ___chromosomes. |
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Definition
| 23. This is half the total needed to create a human being. (V 556) |
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Term
| The sex of an individual is/is not determined at the moment of fertilization. |
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Definition
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Term
| Sex is determined by the male/female gamete. |
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Definition
| male (it carries either an X or Y chromosome; the female is always X). (V 556) |
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Term
| Immediately after fertlization, the zygote begins to undergo _______ cell division called _______. |
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Definition
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Term
Put these in correct chronological order:
embryo, zygote, morula, fetus, blastocyst, sperm cell, |
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Definition
| sperm cell, zygote, morula, blastocyst, embryo, fetus (V 556-560) |
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Term
| Implantation of the embryo occurs at roughly ___ days post-fertilization. |
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Definition
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Term
| The embryonic period begins at _______ |
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Definition
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Term
| T of F The brain undergoes rapid growth prior to the heart beginning to beat. |
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Definition
| F. The heart begins to beat at the beginning of the 4th week post-fertilization, while the brain experiences growth during the 5th post-fertilization week. (V 560) |
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Term
| The end of the embryonic week occurs at the end of which post-fertilization week? |
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Definition
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Term
| T or F. All essential iinternal and external structures are present and undergoing further elaboration and growth by the end of the embryonic period. |
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Definition
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Term
| T or F. The first trimester includes the first two weeks of the fetal period. |
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Definition
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Term
| Surfactant begins to be produced in the lungs by ___ weeks. |
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Definition
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Term
| Teratogens are in general most dangerous in the first/second/third trimester. |
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Definition
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Term
| T or F. During the first two weeks after fertilization, the embryo is highly susceptible to teratogens. |
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Definition
| F. Until implantation occurs, the embryo is largely protected. (V 562) |
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Term
| Vernix caseosa fully coats the entire fetal body by roughly ___ weeks. |
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Definition
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Term
| Brown fat begins to form in the ____ lunar month. |
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Definition
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