Human hormones Typeit

, the release of an egg due to the hormone LH, occurs approximately every days in females. Many other hormones interact to regulate the menstrual cycle, including , which causes an egg to mature, and oestrogen and , which maintain the lining of the uterus.

Some women undergo clomifene therapy, which helps to boost their levels of the hormones FSH and to increase their chances of becoming pregnant, while others may need to undergo the more comprehensive treatment. This treatment uses hormones to stimulate the maturation of the woman's eggs, which are then removed and fertilised in a laboratory. After they begin to develop into , one or two will be inserted into the woman's uterus.

In contrast, many women rely on to prevent them from becoming pregnant. This can come in many forms, each with its own advantages and disadvantages. For example, condoms and diaphragms can act as a barrier to prevent the sperm reaching an , or the woman or the man can have surgery to sterilise them. Hormones can also be taken orally by the woman to inhibit FSH production, or progesterone can be released slowly via an , an implant or a skin patch to stop eggs being released as a long-term measure.

Hormones such as adrenaline and thyroxine also have roles beyond human reproduction. Thyroxine levels in the body are often controlled by feedback.

Thyroxine controls the body's rate, initially stimulating the production of in the hypothalamus when levels are low. (When thyroxine levels are normal, the production of this hormone is inhibited.) This then causes the release of from the pituitary gland, which raises the levels of thyroxine being released from the thyroid.

Adrenaline is involved in the fight or flight stress response. It is responsible for a number of changes in the body, such as increasing blood sugar levels by stimulating the conversion of into glucose in the liver.