What response should the nurse give, while teaching a prenatal class, when asked when cardiac defects occur?
A) "They may occur any time during gestation."
B) "They occur by the end of the ninth week."
C) "They occur before implantation has occurred."
D) "They occur shortly before birth."
B) "They occur by the end of the ninth week."
Explanation: A) By the end of 9 weeks gestation, the main structures are developed, and any structural defects have already occurred.
B) By the end of 9 weeks gestation, the main structures are developed, and any structural defects have already occurred.
C) Once implantation of the embryo has occurred, around the 12th day of human development, the cells begin to undergo mitosis, resulting in differentiation of cell types. By the 17th day of human development, the primary heart field has developed. Heart structures do not begin to form before implantation.
D) By the end of 9 weeks gestation, the main structures are developed, and any structural defects have already occurred.
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