Answers: 1. The first two weeks after conception are referred to as the ______ phase of development. zygote fetal embryonic germinal Score: 1 of 1 2. The fetal phase is reached at _____ weeks after conception. 10 8 9 7 Score: 1 of 1 3. About _____ million sperm cells are released in a typical ejaculation. 50 to 100 400 to 800 200 to 400 100 to 200 Score: 1 of 1 4. At about four days after conception, the cell mass develops a hollow center and is called a: fetus. blastocyst. embryo. zygote. Score: 1 of 1 5. The developing organism is particularly vulnerable during the _____ because this is when the distinct organ systems are being formed. the blastocyst phase the fetal phase the germinal phase the embryonic phase Score: 1 of 1 6. A typical labor last about: 5 to 9 hours. 8 to 12 hours. 11 to 14 hours. 3 to 7 hours. Score: 1 of 1 7. A typical fetus will be _____ times larger at 38 weeks than it was at 9 weeks. 10 20 30 40 Score: 1 of 1 8. At the beginning of the fetal phase of development, the fetus is about: one inch long. two inches long. three inches long. half an inch long. Score: 1 of 1 9. The cardiovascular system is functioning by the end of week: 10. 8. 6. 4. Score: 1 of 1 10. Ashley contracted rubella while she was pregnant. Her unborn child is most likely to be affected if it is in the _____ of development. the embryonic phase the germinal phase the fetal phase the blastocyst phase Score: 1 of 1 11. The outer mass surrounding the embryo becomes: the spinal cord. the brain. the digestive system. the placenta. Score: 1 of 1 12. What phase of development gets its name from the Greek word for “swelling”? the embryonic phase. the fetal phase. the germinal phase. the blastocyst phase. Score: 1 of 1 13. All organ systems except the sex organs are present, though not functional, at the beginning of the _____ phase of development. fetal germinal zygote embryonic Score: 1 of 1 14. The embryonic phase of development lasts from about _____ after conception. weeks 3 through 8 weeks 1 through 7 weeks 5 through 11 weeks 4 through 9 Score: 1 of 1 15. Each organ system begins to form during the _____ phase of development. embryonic fetal germinal zygote Score: 1 of 1 16. Birth typically occurs _____ weeks after conception. 38 40 42 36 Score: 1 of 1 17. The germinal phase ends when: the blastocyst consists of more than 4000 cells. the blastocyst is formed. the blastocyst exits the fallopian tubes. the blastocyst attaches to the uterine wall. Score: 1 of 1
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