受精发生在输卵管，受精卵在输卵管内停留约3天。
输卵管峡部收缩直至受孕后3天，使受精卵在输卵管内发育。这保证了受精卵在子宫内膜的基底部的正常着床。
雌激素是在卵泡、黄体、肾上腺皮质和胎盘合成和分泌的激素。
孕酮是卵巢黄体、肾上腺和胎盘合成和分泌的激素。
促黄体生成激素和促卵泡激素是由垂体前叶合成和分泌的。
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
医学英语构词法：
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