Question:
What changes are observed in the uterus subsequent to implantation of the young embryo in a human female?
What changes are observed in the uterus subsequent to implantation of the young embryo in a human female?
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Think about how the embryo gets food after implantation. Two changes in the uterus help it.
Updated On: Nov 3, 2026
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Solution and Explanation
Step 1: Recall what implantation means:
After fertilisation, the zygote divides and forms a ball of cells, the embryo. The embryo gets attached (implanted) in the wall of the uterus.
Step 2: Change 1: the lining of the uterus:
The uterine lining becomes thick, and it is richly supplied with blood vessels. This blood supply brings food and oxygen to nourish the growing embryo.
Step 3: Change 2: the placenta:
A special tissue called the placenta develops. It is a disc-like structure embedded in the uterine wall.
The placenta forms a connection between the uterus and the embryo. It has villi on the embryo side and blood spaces on the mother's side.
Through this connection the embryo receives glucose and oxygen from the mother, and waste made by the embryo is removed into the mother's blood.
Final Answer:
The uterine lining thickens with many blood vessels, and the placenta forms between the uterus and the embryo. \[ \boxed{\text{Thick, blood-rich uterine lining; placenta develops}} \]
After fertilisation, the zygote divides and forms a ball of cells, the embryo. The embryo gets attached (implanted) in the wall of the uterus.
Step 2: Change 1: the lining of the uterus:
The uterine lining becomes thick, and it is richly supplied with blood vessels. This blood supply brings food and oxygen to nourish the growing embryo.
Step 3: Change 2: the placenta:
A special tissue called the placenta develops. It is a disc-like structure embedded in the uterine wall.
The placenta forms a connection between the uterus and the embryo. It has villi on the embryo side and blood spaces on the mother's side.
Through this connection the embryo receives glucose and oxygen from the mother, and waste made by the embryo is removed into the mother's blood.
Final Answer:
The uterine lining thickens with many blood vessels, and the placenta forms between the uterus and the embryo. \[ \boxed{\text{Thick, blood-rich uterine lining; placenta develops}} \]
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