Pulmonary surfactant, secreted via exocytosis of lamellar bodies (LB) by alveolar type II (AT II) cells, maintains low alveolar surface tension and is therefore essential for normal lung function.
This in turn causes abnormalities in the levels of the other hormones, Estrogen and Progesterone, thus adding to the chemical turmoil in the body. The common causes of Anovulatory Cycles include: Polycystic Ovarian Disease (PCOD). Hyperprolactinaemia (increased blood levels of the hormone Prolactin).
I've heard it's normal to have one anovulatory cycle per year. According to http://www.fertilityfriend.com/HelpC..._patterns.html, There are several potential reasons why your chart may not show ovulation. First, it is not abnormal to have an occasional anovulatory cycle, even if you usually ovulate. In this case, anovulation may not be cause for too much concern if it happens only rarely.