A placenta develops from a:
a. decidua.
b. trophoblast.
c. blastocyte.
d. mesoderm.
b
The outer layer of the blastocyst becomes the trophoblast and develops into the placenta and outer membrane while
the inner layer will develop into the embryo.
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During preconception counseling the nurse tells a woman that the most critical time in the development of a baby is between conception and week eight. What is the nurse's most important rationale for this statement?
1. To emphasize the need to avoid teratogenic substance while trying to get pregnant 2. To emphasize the need to do frequent pregnancy tests while trying to conceive 3. To explain why many pregnancies are spontaneously aborted in the first trimester 4. To explain the need to avoid ultrasound examinations in the first trimester
What is the statistical procedure used when a nurse researcher wants to test a causal model to explain smoking habits in teenagers?
A) Path analysis B) Survival analysis C) Discriminant analysis D) Multivariate analysis of variance
What is the movement of gases across the alveolar capillary membrane from areas of high concentration to areas of lower concentration called?
a. diffusion c. perfusion b. external respiration d. ventilation
Which of the following is a potassium sparing diuretic?
a. Lasix c. Inspra b. Aldactone d. HCTZ