A fertilised ovum undergoes repeated cell divisions while travelling through the uterine tube. Which stage normally implants in the uterine lining?
Correct answer: C. Blastocyst
- A. Primary oocyte
- B. Zygote before cell division
- C. Blastocyst
- D. Mature sperm cell
Explanation
The blastocyst reaches the uterus and implants in the endometrium approximately several days after fertilisation. A zygote is the single cell formed immediately after fertilisation and must divide before implantation can occur.
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About Reproductive Anatomy and Conception
Female and male reproductive organs, pelvic anatomy, gametogenesis, the menstrual cycle and the hormonal control of ovulation lead into fertilisation, implantation and early embryonic development. Questions distinguish ovulation from menstruation, fertilisation from implantation, and the normal anatomical changes that allow conception and pregnancy to occur.
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