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Implantation - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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Implantation is considered one of the most asked concept.
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12 Questions around this concept.
Solve by difficulty
The main function of mammalian corpus luteum is to produce:
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Concepts Covered - 1
Implantation
- The trophoblast differentiates into two distinct layers-
- the inner part is the cytotrophoblast consisting of cuboidal cells that are the source of dividing cells.
- the outer is the syncytiotrophoblast which implants the blastocyst in the endometrium of the uterus by forming finger-like projections called chorionic villi that make their way into the uterus, and spaces called lacunae that fill up with the mother’s blood.
- The syncytiotrophoblast also produces human chorionic gonadotropin (hCG), a hormone that “notifies” the mother’s body that she is pregnant, preventing menstruation by sustaining the function of the corpus luteum.
- Presence of hCG in the urine of a woman indicates pregnancy.
- Implantation is the attachment of the blastocyst to the wall of the uterus of the mother.
- It occurs about a week after fertilization.
- The portion of the blastocyst where the inner cell mass is located lies against endometrium.
- At the point of contact, the trophoblastic cells digest and engulf the endometrial cells and thus, blastocyst sinks into a pit formed in the endometrium.
- Then the blastocyst is completely buried in the endometrium.
- The blastocyst forms villi by means of which it establishes an intimate contact with the uterine wall.
- The blastocyst derives nutrition and lives as a parasite within the uterus of the mother.
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