Scientists measure the amount of ozone gas in a column of air. To measure this, they use Dobson units (DU). Dobson was one of the first scientists to research ozone. One Dob â¦ son unit indicates 0.01 millimeter thickness of ozone gas in a column.
6.1 Role and functional anatomy of the endometrium. 1  Introduction. 2  Functional anatomy of the endometrium. 3  Endometrial functions. 4  Cyclic hormonal alterations of the endometrium The menstruation phase. The follicular or proliferative phase. The luteinizing or secretory phase. During the secretory or luteinizing phase (14th to 28th day) the endometrium differentiates itself due to the influence of progesterone (from the corpus luteum) and attains its full maturity. The glands and arteries begin to entwine. The connective tissue stroma becomes the place of edematous changes. The time period of the maximal reception ability for the blastocyst lies between the 20th and the 23rd day. This phase of the endometrium lasts 4 days and is usually termed the  .
How long does ovulation last? Ovulation usually takes place roughly 14 days after the first day of the start of a period; however, the exact timing can vary greatly from woman to woman. While the timing of ovulation can vary greatly from one woman to another, the duration of ovulation itself is pretty consistent.