Question

Choose the correct statement with respect to implantation of the blastocyst.

• A. Blastocyst normally implants in the fallopian tubes
• B. Trophoblast cells of bastocyst can digest and liquefy the adjacent endometrial cells
• C. After implantation, cell proliferation stops
• D. Placenta formation precedes implantation

Answer 1

The correct option is B Trophoblast cells of bastocyst can digest and liquefy the adjacent endometrial cells

Implantation normally occurs in the endometrium of the uterus. If it occurs anywhere else, it is referred to as ectopic pregancy. Most ectopic pregnancies occur in the fallopian tubes. Ectopic pregancies can also lead to miscarriage.

Trophoblast cells that develop over the surface of the blastocyst release various proteolytic enzymes capable of digesting the immediate uterine cells for implantation to occur. The nutritve materials obtained from such digestion may be used by the blastocyst itself for its growth.

After successful implantation, there is rapid proliferation of cells to form the embryo, various extra embryonic membranes and the placenta.