Question:
Which layer of the blastocyst actively invades the endometrium?
Which layer of the blastocyst actively invades the endometrium?
Show Hint
The multinucleate outer trophoblast layer digests the uterine lining.
Updated On: Nov 12, 2026
- Inner cell mass
- Cytotrophoblast
- Syncytiotrophoblast
- Zona pellucida
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The trophoblast splits into an inner cytotrophoblast and an outer syncytiotrophoblast.
Step 2: Invasion
The syncytiotrophoblast has no cell boundaries and secretes enzymes that digest the endometrium and embed the blastocyst.
Step 3: Eliminate others
The inner cell mass forms the embryo and the zona pellucida disappears before implantation.
Final Answer:
The syncytiotrophoblast invades the endometrium. \[ \boxed{\text{(C) }\text{Syncytiotrophoblast}} \]
The trophoblast splits into an inner cytotrophoblast and an outer syncytiotrophoblast.
Step 2: Invasion
The syncytiotrophoblast has no cell boundaries and secretes enzymes that digest the endometrium and embed the blastocyst.
Step 3: Eliminate others
The inner cell mass forms the embryo and the zona pellucida disappears before implantation.
Final Answer:
The syncytiotrophoblast invades the endometrium. \[ \boxed{\text{(C) }\text{Syncytiotrophoblast}} \]
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