Ovarian and Uterine Cycles

Ovarian Cycle is the process where the eggs mature and travel through the oviduct down to the uterus.
Uterine Cycle is the growth of the lining which prepares for an embryo to implant itself.

• Gonadotropin releasing hormone (GnRH) triggers the release of hormones in the ovarian cycle. GnRH gets released from the hypothalamus and has a target sit in the anterior pituitary which happens to be where LH and FSH get triggered.
• Follicle-Stimulating hormone (FSH) and Luteinizing hormone (LH) have the responsibility of stimulating the eggs to develop and to get ovaries to release estrogen and Progesterone.
• Estrogen and Progesterone are responsible for stimulating the maturity of the lining in the uterus.
• Human Chorionic gonadotropin (hCG) only comes to play once an individual is pregnant. This has the responsibility to act like LH and trigger the release of progesterone and estrogen. However LH and FSH are not hormones used during Pregnancy.

A positive loop is when a follicle bursts releasing a mature egg in the ovaries. Since the egg was released greater levels of hormones are needed to ensure the egg could develop into a fetus if fertilized. If the egg doesn't get fertilized the hormone levels go back down. A negative loop is seen when the GnRH becomes greater due to excessive amounts of other hormones in her system such nocentrations are not needed to control hormone levels, when there is enough in the body.

First Trimester:
the zygote begins to divide into millions of cells. The next step is an embryo and then a fetus. When it is a fetus it begins to release hormones, grow little hairs, glands and organs are in their first stages of development.

Second Trimester:
The fetus is more life size and its lungs and brain starts to develop.

Third Trimester:
Everything is finished growing and the baby is ready to be born and come into the real world.