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Preksha Dhyana :
Progesteron acts in close collaboration with oestrogen and affect tissues which have already been influenced by the latter. Its principal function is to prepare the system for pregnancy. Uterus and Its Functions
The uterus is a hollow, pear-shaped organ situated in the pelvic cavity. It is held in place by four pairs of supporting ligaments and by the muscles of the pelvic floor. Two uterine tubes open into the cavity.
During the reproductive years each menstrual cycle prepares the uterus to receive the fertilized ovum, and to retain and nourish the developing fetus throuhout the duration of pregnancy. At the end of pregnancy the muscular walls of the uterus contract to expel the fetus.
The uterine tubes (Fallopian tubes) are about 10 cm long. They extend from the uterus to curve round the ovaries. These tubes serve as ducts to convey the ovum from the ovary to the uterus. The ovum is prepelled towards the uterus by peristaltic contractions of the smooth muscles.
Fertitization of an ovum by a sperm usually occurs in one of these tubes, and the fertilized Orum normally continues its journey towards uterus where it implants. Occasionally a tubal pregnancy occurs put rarely proceeds beyond six weeks and is aborted. Mammary Glands (The Breasts)
The breasts are accessory organs of the female system. They begin to enlarge and develop at puberty due to the influence of the ovarian hormones. During pregnancy there is further growth and development and changes occur in preparation for lactation. After childbirth release of prolactin from the posterior pituitary stimulates the process of lactation while oxytocin (from the same gland) causes the expulsion of milk to the ducts. The secretion of oxytocin is stimulated by the infant sucking at the breast. Regular sucking is necessary to maintain lactation.
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