ischemic phase:

### -days 27 - 28 -both estrogen and progesterone levels drop -spiral arteries undergo vasoconstriction -endometrium becomes pale, blood vessels rupture -blood escapes uterine stromal cells, gets ready to be shed -corpus luteum degenerates

## Step1: Identify the Phase### The ischemic phase is part of the menstrual cycle that occurs after ovulation. It is characterized by a drop in estrogen and progesterone levels.## Step2: Describe Hormonal Changes### During the ischemic phase, both estrogen and progesterone levels drop significantly.## Step3: Explain Vasoconstriction### The spiral arteries in the endometrium undergo vasoconstriction, reducing blood flow to the area.## Step4: Describe Endometrial Changes### The endometrium becomes pale and the blood vessels rupture, leading to blood escape from the uterine stromal cells.## Step5: Prepare for Menstruation### The uterine stromal cells get ready to be shed as the endometrium prepares for menstruation.## Step6: Degeneration of Corpus Luteum### The corpus luteum, which secretes progesterone, degenerates, leading to further drops in hormone levels.