The nurse is preparing a teaching session for pregnant clients that reviews the fetal growth and development that occurs in the first 3 weeks post-conception. What should the nurse include in this teaching?
1. How the embryo has attached to the wall of the uterus
2. Development of the fetal membranes and the amniotic sac
3. How the embryo will be covered with a protective substance called vernix caseosa
4. How development of the fetal placenta has begun
5. How the embryo is covered with a soft, downy hair
Correct Answer: 1, 2, 4
Rationale 1: Events occurring concurrently during the first 3 weeks include the embryo's being implanted in the endometrium of the uterus.
Rationale 2: Events occurring concurrently during the first 3 weeks include fetal membranes' differentiating into the chorion—the precursor to the placenta—and the amnion, the precursor to the amniotic sac.
Rationale 3: At the end of the second trimester, or 6 lunar months, a protective covering called vernix caseosa begins to develop over the skin.
Rationale 4: Events occurring concurrently during the first 3 weeks include the function of the placenta.
Rationale 5: At the end of the second trimester, or 6 lunar months, lanugo—a fine downy hair—covers the body.
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