The nurse is explaining to a primigravida how the zygote becomes implanted into the uterus. How would the nurse describe the structure formed in this process known as the blastocyst?
A) A ball of about 16 identical cells is formed when the zygote divides.
B) The endometrium is enriched in nutrients in preparation for pregnancy.
C) A group of cells is forming what will become the embryo.
D) First one, then two layers of cells surround a fluid-filled space.
D
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The zygote divides rapidly, until it forms a ball of about 16 identical cells, which is then called a morula. The morula is then swept down the fallopian tube and into the uterus, a process that takes approximately 7 to 9 days. The lining of the uterus, or endometrium, has become rich in nutrients in preparation for the pregnancy. Just before the morula reaches the uterus, the cells begin to form layers; first one, then two layers surround a fluid-filled space, called a blastocyst. Another group of cells form what will become the embryo.
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