<prompt> Corpus luteum secretesProgesteroneOestrogenInhibinAll of the above  <response>: D. i.e. All of the above 80 - Dutta 4th 28 - 29- Shaw14th Predominantly progesterone is secreted by the corpus luteum to support the endometrium of the luteal phase. There is also secretion of oestrogen, inhibin and relaxin Progesterone along with oestrogen from corpus luteum maintains the growth of the fertilized ovum Corpus luteum reaches maximum maturity by the 22nd day of the normal cycle 2 cm or more Corpus luteal fluid contains - Phospholipids, cholesterol and carotene yellow colour - Lutein The regression is attributed to fall in LH and rise in the level of oestrogen and PGF2 aCorpus luteum of pregnancy There is surge of hyperplasia of all the layers between 23rd to 28th day due to chorionic gonadotrophin, hCG like LH will stimulate corpus luteum to secrete progesterone The corpus luteum of pregnancy is functionally active upto the 10 to 12th week in human beings 