Biology · Human Reproduction
Which of the following statements regarding embryonic implantation and its hormonal regulation is MOST correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Implantation bleeding is primarily due to progesterone deficiency and typically occurs 3-4 weeks after fertilization.
- 2Implantation takes place in the fallopian tube within 5 days, and the endometrium after implantation is called the placenta.
- 3Implantation occurs 6-8 days after fertilization near the fundus of the uterus, involves stages of apposition, adhesion, and invasion, and hCG is secreted by syncytiotrophoblast cells to maintain the corpus luteum.✓
- 4Implantation occurs 2-3 days after fertilization, usually in the cervix, and hCG is secreted by the corpus luteum.
Correct answer
Implantation occurs 6-8 days after fertilization near the fundus of the uterus, involves stages of apposition, adhesion, and invasion, and hCG is secreted by syncytiotrophoblast cells to maintain the corpus luteum.
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