Question

During implantation, the cells of __________ secrete lytic enzymes and destroy endometrial cells.

• A. syncytiotrophoblast
• B. corona radiata
• C. embryonic disc
• D. cytotrophoblast

Hint:

Syncytiotrophoblast plays a key role in implantation and placental formation.

Answer 1

The Correct Option is A

Step 1: Understanding implantation.
Implantation is the process by which the blastocyst embeds into the uterine endometrium.
Step 2: Role of syncytiotrophoblast.
Cells of the syncytiotrophoblast secrete proteolytic enzymes that digest endometrial tissue, allowing the embryo to implant securely.
Step 3: Conclusion.
Hence, the correct answer is (A) syncytiotrophoblast.