Mensuration
Day 1-5
-decline of estrogen & progesterone cause the spiral arteries to constrict, cells become ischemic & die, are sloughed off or shed
-bleeding last for 3-5 days
Proliferative Phase
Day 6-14
-estrogen stimulates growth of blood vessels of the endometrium, causing it to double in thickness
-thickening of endometrium allows ovulated eggs to be caught to cause implantation
Secretory Phase
Day 15-28
-in response to rising levels of progesterone by the corpus luteum, the uterus becomes ready for preganancy
-uterine glands enlarge & secrete nutrients to sustain the embryo until implantation occurs
-If pregnancy does not occur, towards the end of phase, LH levels drop due to high levels of progesterone
-progesterone levels drop following decline in LH, leasing into menstrual phase