Implantation of the embryo takes place in which week of pregnancy?
Correct answer: B. 2nd
- A. 1st
- B. 2nd
- C. 3rd
- D. 4th
Explanation
In the second week of pregnancy, the zygote continues to divide and forms a ball of cells called a blastocyst. The blastocyst further develops as it moves down the fallopian tube and towards the uterus. By the end of the second week implantation of the blastocyst in the endometrium begins.
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