受精發生在輸卵管，受精卵在輸卵管內停留約3天。
輸卵管峽部收縮直至受孕後3天，使受精卵在輸卵管內發育。這保證了受精卵在子宮內膜的基底部的正常著床。
雌激素是在卵泡、黃體、腎上腺皮質和胎盤合成和分泌的激素。
孕酮是卵巢黃體、腎上腺和胎盤合成和分泌的激素。
促黃體生成激素和促卵泡激素是由垂體前葉合成和分泌的。
The nurse is conducting a prenatal class on the female reproductive system. When a patient in the class asks why the fertilized ovum stays in the fallopian tube for 3 days, what is the nurse's best response?
1. "It promotes the fertilized ovum's chances of survival."
2. "It promotes the fertilized ovum's exposure to estrogen and progesterone."
3. "It promotes the fertilized ovum's normal implantation in the top portion of the uterus."
4. "It promotes the fertilized ovum's exposure to luteinizing hormone and follicle-stimulating hormone."
答案：3
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