How does the fetus remain in the endometrium during growth?
Context This question pertains to the process of fetal development and implantation within the uterine wall. Specifically, it addresses the apparent mismatch between the initial embedding of the embryo in the endometrium and the subsequent growth of the fetus, questioning how a relatively thin epithelial layer can contain a progressively larger fetus. Simple Answer The embryo initially burrows into the endometrium's lining. As it grows, the endometrium's cells change and thicken, creating a supportive structure. The placenta develops, a vital organ connecting the fetus to the mother. The placenta helps the fetus get nutrients and oxygen and remove waste. The fetus grows within a protective sac formed by membranes, and the uterus expands to accommodate the growing fetus. Detailed Answer Initially, the embryo implants itself within the endometrium, the lining of the uterus. This process involves the embryo's interaction with the endometrial cells, which modify their structure...