The enzymes in your stomach have evolved to work most efficiently at the pH of your stomach, so changing the environment around them would cause them to not work nearly as effectively, if at all.
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.
Cells, tissues, organs, organ systems, whole organism
