The process of implantation is characterized by which of following processes? Select all that apply
1. The trophoblast attaches itself to the surface of the endometrium.
2. The most frequent site of attachment is the lower part of the anterior uterine wall.
3. Between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the uterine lining.
4. The lining of the uterus thins below the implanted blastocyst.
5. The cells of the trophoblast grow down into the uterine lining, forming the chorionic villi.
Correct
1; 3; 5
Rationale:
1. During implantation, the trophoblast attaches itself to the surface of the endometrium, and between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the thickened uterine lining. The cells of the trophoblast grow down into the thickened lining forming the chorionic villi. The most frequent site of attachment is not the lower part of the anterior wall, but rather the upper part of the posterior uterine wall. The lining of the uterus thickens, rather than thins, below the implanted blastocyst.
2. During implantation, the trophoblast attaches itself to the surface of the endometrium, and between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the thickened uterine lining. The cells of the trophoblast grow down into the thickened lining forming the chorionic villi. The most frequent site of attachment is not the lower part of the anterior wall, but rather the upper part of the posterior uterine wall. The lining of the uterus thickens, rather than thins, below the implanted blastocyst.
3. During implantation, the trophoblast attaches itself to the surface of the endometrium, and between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the thickened uterine lining. The cells of the trophoblast grow down into the thickened lining forming the chorionic villi. The most frequent site of attachment is not the lower part of the anterior wall, but rather the upper part of the posterior uterine wall. The lining of the uterus thickens, rather than thins, below the implanted blastocyst.
4. During implantation, the trophoblast attaches itself to the surface of the endometrium, and between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the thickened uterine lining. The cells of the trophoblast grow down into the thickened lining forming the chorionic villi. The most frequent site of attachment is not the lower part of the anterior wall, but rather the upper part of the posterior uterine wall. The lining of the uterus thickens, rather than thins, below the implanted blastocyst.
5. During implantation, the trophoblast attaches itself to the surface of the endometrium, and between 7 and 10 days, the zona pellucida disappears and the blastocyst implants itself in the thickened uterine lining. The cells of the trophoblast grow down into the thickened lining forming the chorionic villi. The most frequent site of attachment is not the lower part of the anterior wall, but rather the upper part of the posterior uterine wall. The lining of the uterus thickens, rather than thins, below the implanted blastocyst.
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