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  .
Luteal phase (day 15-28) This phase begins on the 15th day and lasts till the end of the cycle. The following events occur during this phase: The egg cell released during the ovulation phase stays in the fallopian tube for 24 hours. If a sperm cell does not impregnate the egg cell within that time, the egg cell disintegrates. The hormone that causes the uterus to retain its endometrium gets used up by the end of the menstrual cycle.