Answer it is initially formed as a filtrate of plasma

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Answer: It is initially formed as a filtrate of plasma from maternal blood, but later contains fetal urine and sloughed-off embryonic cells. It serves as a shock absorber, temperature regulator, and prevents adhesion of the developing fetus to surrounding tissues. Topic: EMBRYONIC DEVELOPMENT 38) List the stages of labor and briefly describe the events that occur in each stage. Answer: 1. Stage of dilation2. Stage of expulsion of fetus3. Stage of expulsion of placenta Descriptions are on p. 843. Topic: LABOR 4
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39) Place the following events in correct order and briefly define each: implantation, f ertilization, fetal period, labor, cleavage, embryonic development, placental development. Answer: 1. Fertilization: sperm cell enters a secondary oocyte; nuclear material merges into a single nucleus of the zygote 2. Cleavage: early divisions of the zygote 3. Implantation: attachment of the blastocyst to the endometrium 4. Embryonic development: first two months of development during which the rudiments of organs and the embryonic membranes develop 5. Placental development: production of the placenta from the embryonic chorion and the maternal decidua basalis, by the end of the third month of development 6. Fetal period: period of growth from second month to birth 7. Labor: process of expulsion of fetus from the uterus and through the vagina Topic: STAGES OF DEVELOPMENT SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 40) Twins that result from the separation of the developing cells into two embryos sometime during the first 7 days of development are called _____ twins. Answer: monozygotic (identical) Topic: FERTILIZATION 41) A zygote consists of a fertilized ovum and _____. Answer: zona pellucida Topic: FERTILIZATION 43) The cells of the embryo produced by cleavage are called _____. Answer: blastomeres Topic: CLEAVAGE 45) Implantation usually occurs on the _____ wall of the fundus or body of the uterus. Answer: posterior Topic: IMPLANTATION 46) Differentiation of the tissue of the embryo into the three primary germ layers begins _____ (before or after) implantation. Answer: after Topic: EMBRYONIC AND FETAL DEVELOPMENT 50) Deoxygenated, waste-laden blood leaves the fetus through a blood vessel called an umbilical _____. Answer: artery Topic: EMBRYONIC AND FETAL DEVELOPMENT 51) In the placenta, nutrients, gases, and wastes are exchanged between blood vessels of the chorionic villi and _____ of the maternal portion of the placenta. 5
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Answer: intervillous spaces or sinuses Topic: EMBRYONIC DEVELOPMENT 52) In the months of development after the _____ month, the embryo is referred to as a fetus. Answer: second Topic: EMBRYONIC AND FETAL DEVELOPMENT MATCHING. Choose the item in Column 2 that best matches each item in Column 1. Match the stages of development in Column 1 with their descriptions in Column 2. 55) Column 1: morula Column 2: solid ball of cells resulting from cleavage Answer: solid ball of cells resulting from cleavage Topic: CLEAVAGE 56) Column 1: zygote Column 2: a fertilized ovum, containing a segmentation nucleus and surrounded by the zona pellucida Answer: a fertilized ovum, containing a segmentation nucleus and surrounded by the zona pellucida Topic: FERTILIZATION 57) Column 1: blastocyst Column 2: hollow ball of cells Answer: hollow ball of cells Topic: CLEAVAGE 58) Column 1: blastocyst Column 2: stage of development that enters the uterus
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