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When teaching a class of nursing students, the nurse asks why the embryonic period (weeks 48) of pregnancy is so critical.
A. Duplication of genetic information takes place.
B. Organogenesis occurs.
C. Subcutaneous fat builds up steadily.
D. Kidneys begin to secrete urine.
Correct Answer: B
Explanation/Reference:
Explanation:
(A) Duplication of genetic material occurs during the preembryonic period (weeks 13) following conception. The exact duplication of genetic material is essential for cell differentiation, growth, and biological maintenance of the organism. (B) Weeks 48, known as the embryonic period, are the time organogenesis occurs and pose the greatest potential for major congenital malformations. All major internal and external organs and systems are formed. (C) Subcutaneous fat does not develop until the latter weeks of gestation. (D) Kidneys begin to secrete urine during the 13th16th week.
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