Page
  1. 1
    1
  2. 2
    2

The cycle reproductive changes in females is marked my the menstrual cycle.during which some cells, unclotted blood from ruptured blood vessels, other fluids and the uterine endometrium is released through the cervix and vagina.

Extracts from this essay...

Introduction

The Menstrual Cycle 25 February 2003 George Beard The cycle reproductive changes in females is marked my the menstrual cycle.during which some cells, unclotted blood from ruptured blood vessels, other fluids and the uterine endometrium is released through the cervix and vagina. Each menstrual cycle occurs every 28 days and lasts for 4-5 days. an ovum is released from the ovary (ovulation) about once every 4 weeks. The menstrual cycle (of 28 days)

Middle

Menses occur when fertilization does not take place. (2) The proliferative (follicular) phase The proliferative phase occurs between the end of menses, and ovulation. In this phase, under the stimulation of estrogen, the uterine endometrium undergoes a process of growth (proliferation) and a new thick endometrium is formed. In the ovary, the follicle begins to develop into a Graafian follicle. This phase cycle days 6 to 13 or 14 in a 28 day cycle. (3) The ovulatory phase The ovulatory phase indicates the rupture of the Graafian follicle and release of the ovum (ovulation).

Conclusion

The endometrium which is under the influence of progesterone and estrogen, increases in size, becomes thick, the endometrial glands become enlarged, undergo maximum secretory activity and its blood vessels become coiled and enlarged These hormones regulate the menstrual cycle.These hormones have profound effects on the ovaries and the uterus. The anterior pituitary gland produces two gonadotrophic hormones: the follicle stimulating hormone (FSH) and the luteinizing hormone (LH). FSH stimulates the ovarian follicle to mature and secondly, it stimulates the follicle to produce estrogen. The estrogen brings about healing and repair of uterine wall (endometrium) following menstruation.

The above preview is unformatted text

Found what you're looking for?

  • Start learning 29% faster today
  • Over 150,000 essays available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Over 180,000 student essays
  • Every subject and level covered
  • Thousands of essays marked by teachers
  • Over 180,000 essays
    written by students
  • Annotated by
    experienced teachers
  • Ideas and feedback to write
    your own great essays

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.