Uterine (menstrual) cycle,”Menstruation initiated whencorpus luteum degenerates- Other mammals have estrouscycles (uterine cycle withoutbleeding)- Proliferative phase • Endometrium becomesthicker and morevascularized- Secretory phase • Glands develop that secretenutritive substances tosustain embryo for first 2weeks- If embryo does not implant,lining shed- If embryo does implant

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