A friend confides that she desires to have children but is having trouble conceiving. Which of the following is true regarding implantation?
A) An estimated 60% of implanted embryos later miscarry due to genetic defects of the embryo.
B) Detection of human chorionic gonadotropin (hCG) in blood or urine indicates failure of the blastocyst to implant.
C) It is estimated that a minimum of two-thirds of all zygotes formed fail to implant by the end of the first week or spontaneously abort.
D) In cases where implantation fails to occur, a nonreceptive uterus becomes receptive once again.
C
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