After conception comes the process of fertilization, which is the process in which sperm cells must be present in the woman's reproductive tract at the time the egg enters the fallopian tube. This can happen in several ways. If the woman has intercourse with a man during the week preceding ovulation, then he may deposit semen (a fluid containing sperm cells) into the woman's vagina. Some of the sperm can make their way through the cervix (the opening of the uterus, located at the end of the vagina), into the uterus, and on up into the fallopian tubes. There, one of them may meet with the egg as it travels down one of the tubes toward the uterus.
The menstrual cycle of fertile women usually lasts about a month. This time and under the influence of the body’s own natural hormones, a tiny sac within the ovary containing an egg grows to about the size of a grape. At a point midway in the cycle, this egg is released from the ovary and ovulation occurs. Ovulation is also regulated by hormones. The egg, which is ready for fertilization, then passes into the uterine tubes to await the arrival of fertile sperm.
This can be caused by overuse in cosmetics or stress. (Wikipedia) Progesterone is a hormone produces from the ovaries during ovulation. It helps with preparation of the uterus for receiving an egg for fertilization. The menstrual cycle will occur if the egg is not fertilized and progesterone levels decrease. High levels of progesterone occurs during pregnancy.
The chemistry of pregnancy and progesterone Pregnancy is the development and fertilization of offspring. The name of the offspring that is growing in a women’s uterus is known as an embryo or fetus. Delivery of child usually happens, about 38 weeks after conception. This is roughly 40 weeks from the start of the last normal menstrual period. Conception can be attained by sexual intercourse or with a form of assisted reproductive technology.
The empty sac on the ovary called the corpus luteum is stimulated by another hormone from the pituitary gland called luteotropin. The corpus luteum begins to produce the estrogen and progesterone hormone. The progesterone hormone prepares the lining of the uterus to have the fertilized egg (egg combined with sperm) attach to the lining of the uterus and begin to develop into a fetus. If the egg is not fertilized, the corpus luteum stops producing estrogen and progesterone, it disappears, the lining of the uterus sloughs off and a menstrual period begins. Then the menstrual cycle starts all over again and will continue monthly unless pregnancy occurs or menopause
In Vitro Fertilization (IVF) is a procedure in which an egg (oocyte) from a woman’s ovaries is removed and separately fertilized with male sperm in a laboratory before being implanted into the woman’s fallopian tubes. 1 2 The first stage of IVF is called superovulation. Follicles are structures within which the oocyte develops, in order to retrieve multiple follicles several hormone and drug combinations are administered. Consequently, the ovary stops function and allows the follicles to ripen at the same time when stimulated therefore providing an increased number of eggs to harvest. Follicles are considered mature after 8 to 9 days and human chorionic gonadotropin (hCG) is administered which enables the final maturation of the oocytes.3 Oocyte retrieval occurs through a procedure called ultrasound guided vaginal retrieval.
The vagina also starts to enlarge but cannot be seen from the outside and one fifth of g... ... middle of paper ... ...us barrier in the cervix opening to protect the embryo that could be growing in the uterus. Fertilisation is when the spermatozoa reach the mature egg in the fallopian tube. It happens generally through sexual intercourse and the spermatozoa are ejaculated into the vagina, it travels through the cervix opening and meets the mature ovum in the fallopian tube. All it takes is one sperm cell to fertilise and egg. The sperm cell (male) and egg cell (female) are each called haploid cells; these are cells with one set of twenty three chromosomes.
The ovaries also produce hormones. The two oviducts each link the two ovaries with the uterus. They carry the ripe eggs to the uterus. When a male fertilizes a female's egg, it usually occurs in the oviduct. The uterus is where the fertilized egg grows and is nourished until it is ready to come out.
This is how fertilization works: After ovulation, the ovum migrates in the fallopian tube towards the uterus. In the next twelve to 24 hours she is fertile. The sperm arriving at the ovum try to drill through its shell. Fertilization
If conception does not occur preparations, in the form of a series of changes each month, are abandoned. The materials that are produced each month are scrapped and a fresh cycle begins, preparing again for conception. This regular sequence is termed the menstrual cycle because of the discharge of fluid (menses) occurring via the vagina at regular intervals. The events of this cycle are divided into four stages: - 1 Menstrual 2 Follicular 3 Ovulatory 4 Luteal Phase 3, which is mid cycle, is the time that the ovum is released from the ovary (this is what is known as ovulation).