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Lemur [1.5K]
4 years ago
5

What happens to the uterus lining during days 1-12 as estrogen is rising?

Biology
1 answer:
disa [49]4 years ago
6 0
During the first phase of the menstrual cycle which is called the follicular phase, estrogen hormone will gradually increase causing the uterus lining to thicken. This thickening of uterine lining is preparation for possible implantation of embryo if fertilized egg travels safety to the uterus. 
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