When teaching a class of nursing students, the nurse asks why the embryonic period (weeks 4-8) of pregnancy is so critical.

Question

Options

• ADuplication of genetic information takes place.
• BOrganogenesis occurs.
• CSubcutaneous fat builds up steadily.
• DKidneys begin to secrete urine.

• B
  88% (23)
• C
  4% (1)
• D
  8% (2)

Explanation

(A) Duplication of genetic material occurs during the preembryonic period (weeks 1-3) following conception. The exact duplication of genetic material is essential for cell differentiation, growth, andbiological maintenance of the organism. (B) Weeks 4-8, 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 13th-16th week.

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