Answer: Chorion.
- A Chorion
- B Amnion
- C Allantois
- D Yolk sac
Correct answer: A. Chorion
Explanation: The chorionic villi of the trophoblast form the foetal contribution to the placenta, interlocking with the maternal endometrial tissue.
The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.