The Menstrual Cycle In Women

1642 Words7 Pages
A normal pregnancy usually will last for about 40 weeks, this is the first day of the woman’s last menstrual period, this is about two weeks before conception occurs. Pregnancy is normally broken down to trimesters. Each last for 12 to 13 weeks. During each trimester, distinct change takes place in the woman’s body as well as the development of the fetus. Oestrogen and Progesterone The menstrual cycle in women occurs every 28 days on average. During this process, the lining of the uterus is being prepared for pregnancy if pregnancy does not happen the lining is then shed at menstruation, also known as the period. Menstruation takes place for about 5 days. In order to keep this cycle going several hormones need to be present as they are…show more content…
Fertilization Once the penis releases semen into the woman's vagina, some of the sperm remains in the back of the vagina and an even smaller amount makes its way up through the cervix, into the uterus and down the fallopian tubes. This is when the sperm and egg meet in the Fallopian tube. Even though many sperms meet the egg, only one sperm enters the ovum. Once a single sperm has penetrated through the outer surface of the egg cell, on the surface of the egg the chemical changes to prevent other sperm from entering and this is when fertilization begins. This is when the egg and the sperm nuclei fuse and it forms a zygote.…show more content…
This normally happens in week 5. The unborn baby will develop and grow in the amniotic sac, which is a bag of fluid inside the woman’s womb. It is made up of two membranes called the amnion and the chorion. The amniotic sac is filled with clear, pale colored fluid, where the unborn baby floats and moves. This fluid will help to cushion the baby from any bumps and injury, as well as providing them with fluids that they can breathe and swallow. This also supports the baby’s musculoskeletal system, to further develop and maintain a constant temperature for the baby. This fluid is mainly composed of water. Once the embryo has developed the baby is 1/17 of an inch long. This is the rapid growing week known as the 6th week. In this week, the zygote starts to have a heart beat and the arms and legs will start to develop along with some other organs. By week 7 the size of the baby is around 1/3 inch, the organs like the brain, intestine, nostril, lenses will start to grow. As the arms and legs continue to develop. In week 8 the baby will begin to have a fluttering heartbeat, fingers start to develop, the leg buds will start to show feet. The face will change with ears, eyes and the tip of the nose. The intestine will continue to further develop. By the third month, almost all the organs would have developed by now.

More about The Menstrual Cycle In Women

Open Document