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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