The Reproductive System 467
LEVELS OF (^)
GONADOTROPIC
LH Pituitary
(^)
HORMONES IN BLOOD (^)
gland (^)
(^) FSH (^)
0 7 14 21 28 days (^)
Ovarian cycle (^)
Luteal (^)
Developing follicles Ovulation Corpus luteum regression (^)
Follicular phase Luteal phase (^)
HORMONE BLOOD LEVELS (^)
Estrogen (^)
Progesterone (^)
0 7 14 21 28 days (^)
ENDOMETRIAL CHANGES (^)
DURING MENSTRUAL CYCLE (^)
Menstrual Proliferative Ovulation Secretory Menstrual ®
phase phase phase phase (^) Learning^
(^)
0 7 14 21 28 days (^) Cengage^
©^
Figure 19- 9 The menstrual cycle.