The progesterone and estrogen from the ovarian cycle also control the menstrual cycle: If implantation doesnt occur and the levels of estrogen and progesterone fall, the endometrium sloughs off, and menstrual bleeding begins. MENSTRUAL CYCLE HORMONES NSC Grade 12 Preparatory Examination September 2012 Paper 2 Question 4.
2 Chemical coordination within the body is Hormonal control of menstrual cycle. The ovarian hormones circulate in the blood and are excreted in modified forms in the urine. Estimation of the urinary output by chemical methods gives an indication of the blood levels and of the total production of these substances. Normal menstruation. Each menstrual period lasts for about five days Hormonal control of menstrual cycle essay, All about cycle lengths. The terms menstruation and menstrual are derived from the Latin word for month, which in turn relates to the Greek word mene, meaning moon.
Hormonal control of the menstrual cycle The menstrual cycle lasts about 28 days, although there is some variation. It involves interactions between the pituitary gland in the base of the brain, the follicles in the ovary, and the lining of the uterus.
May 05, 2014 The menstrual cycle is a term used to describe monthly events that occur within a woman's body in preparation for the possibility of pregnancy. Each month, an egg is The Menstrual Cycle. The menstrual cycle begins when a girl reaches the age of puberty.
It is the reproductive cycle that produces eggs for fertilisation. Menstrual Cycle Essay Revision. Write an essay on the hormonal control of the menstrual cycle. What occurs in the uterine and ovarian cycles? The menstrual cycle which begins at puberty and ends at menopause, describes the cyclic changes in the uterus and the ovary. The main function of the ovary is to produce a haploid oocyte Flowchart of the hormonal control of the menstrual cycle The menstrual cycle can be described by the ovarian or uterine cycle.
The ovarian cycle describes changes that occur in the follicles of the ovary whereas the uterine cycle describes changes in the endometrial lining of the uterus.
The menstrual cycle begins with menstrual bleeding (menstruation), which marks the first day of the follicular phase. When the follicular phase begins, levels of estrogen and progesterone are low.
As a result, the top layers of the thickened lining of the uterus (endometrium) break down and are shed, and menstrual bleeding occurs.