Female Hormone Regulation

Slides:



Advertisements
Similar presentations
The Menstrual and Ovarian Cycles
Advertisements

Female Hormonal Cycle or the MENSTRUAL CYCLE MENSTRUAL CYCLE Normal cycle length is considered 28 days, however it can range from days divided.
Female Reproductive Hormones
LE 46-9b Vagina Cervix Oviduct Ovaries Uterus Endometrium Follicles Corpus luteum Uterine wall.
The Human Menstrual Cycle What is the importance and stages in the human menstrual cycle?
Animal Reproduction.
Stage 1 – Menstruation Starts on Day 1 – lasts 3-7 days Hormones – travel in blood to target tissue – ALL 4 hormones at lowest levels Ovary – – Follicle.
 Produced by endocrine glands  Male endocrine glands = Testes  Female endocrine glands = Ovaries.
The Menstrual and Ovarian Cycles The Truth behind PMS!!
Female Physiology. Ovarian Cycle 28 days The cycle in which an oocyte matures, erupts from the ovary, and then travels down the oviduct. If not fertilized.
FEMALE REPRODUCTIVE SYSTEM
Role of Hormones in Menstrual Cycle Anton, Barbara, Gabi.
Do Now Name three organs of the female reproductive system
Hormones of the female reproductive cycle: Anterior pituitary gland: Follicle stimulating hormone (FSH): Stimulates growth of ovarian follicles, and estrogen.
Pituitary Gland FSH Primordial follicles Growing follicles LH.
C) The Menstrual Cycle The female menstrual cycle takes an average of 28 days. (Variation is common). The cycle occurs in four phases if no fertilization.
Ovulation and Menstruation. Function of Menstrual Cycle Uterine walls thickens with rich blood supply in preparation for a fertilized egg If fertilization.
 Follicle Stimulating Hormones (FSH) and Luteinizing Hormone (LH)- released in the pituitary gland.  Estrogen- Development of the female secondary sexual.
Read page 520 as a class.  Enlarged breasts  Less facial hair than men  Hair growth in armpits and pubis  Wider at the hips than shoulders  Fat deposits.
Hormone Cycles. Pg. 394 Male Hypothalamus releases GnRH GnRH causes the pituitary to release: Male FSH Male FSH which : – Acts on sperm producing.
The Male Reproductive System
By Amy Demone and Anna Naylor
Menstruation IF fertilization does NOT take place Menstrual cycle – a series of changes controlled by hormones that help prepare the female uterus for.
The Endometrial Cycle (Menstrual cycle)
Menstrual Cycle. The Cycle Strongly linked to the endocrine system (hormone based) Typically takes 28 days to cycle through 4 phases ◦ Follicular ◦ Ovulation.
Reproductive Hormones
Hormonal Control of the Menstrual Cycle Inside the ovary of females there are large sac like structures called Graafian follicles Each follicle contains.
Did you know? At least 40% of all girls get pregnant before they turn 20 years old. -Resource Center for Adolescent Pregnancy Prevention.
Menstrual cycle is regulated by fluctuating levels of sex hormones These hormones produce certain changes in the ovaries and uterus.
Menstrual Cycle Regulation
FEMALE REPRODUCTIVE SYSTEM
Accelerated Biology.  Some important vocabulary  Follicle – a cluster of cells that surrounds an immature egg and provides it with nutrients (where.
Human Reproduction 6.6.
Reproductive System Cont. Female Anatomy & Physiology Chapter 28.
Reproductive Hormones. Male gonads (testes) produce sperm. Female gonads (ovaries) produce eggs.
The Menstrual Cycle.  Releasing of one egg (ovulation) every month from the ovaries  4 steps: Preparing the egg Releasing egg Preparing the endometrium.
Female Reproductive System
Human Reproductive Systems Chapter 50, section 3 only.
Organismal Development Part 4
PART 2B THE FEMALE REPRODUCTIVE SYSTEM - HORMONES.
The Menstrual Cycle Purpose: to bring an egg to maturity and to prepare the reproductive system for pregnancy. 28 day cycle (on average) Repeats continuously.
May 24, 2010 Ms. Simon Regents Biology. Do Now: 1) Pass forward Regents Questions 2) Compare the female reproductive systems of birds, amphibians and.
Female Reproductive Cycle
Female Reproductive Cycle
Biology 12 Unit 2: Reproduction and Development Female System.
Objective To describe the process of oogenesis, the ovarian cycle, and the uterine cycle.
Aim: How can hormones influence the reproductive cycles in humans?
Aim: How can hormones influence the reproductive cycles in humans? Do Now: Using the diagrams below, which structures produce hormones? What hormones are.
Biology 12 THE FEMALE MENSTRUAL CYCLE.  The menstrual cycle is the term for the physiological changes that can occur in fertile women for the purposes.
The Female Reproductive System. Overview The female reproductive system produces only a limited number of gametes Most structures are located inside the.
The Uterine (Menstrual) Cycle CHRISTIAN CHEW BIOL 260 | TUESDAY LAB | TONINI.
Female Reproductive System. –Section 1: Structure and their function –Section 2: Menstruation.
Chapter 21 Female Reproduction.
Uterine (Menstrual) Cycle
Unit B: Reproduction and Development
The Menstrual Cycle Biology 12.
The Menstrual Cycle.
Menstruation IF fertilization does NOT take place
Menstruation IF fertilization does NOT take place
Human Reproduction 6.6.
Human Reproduction The Menstrual Cycle.
The Menstrual Cycle.
Organismal Development Part 4
Menstrual Cycle.
1. FSH: Follicle-stimulating hormone; and LH: luteinizing hormone
Organismal Development Part 4
The Menstrual Cycle.
Presentation transcript:

Female Hormone Regulation

Reminder Hypothalamus secretes GnRH GnRH stimulates anterior pituitary to release FSH and LH

FSH function in females Responsible for follicular phase FSH stimulates maturation of ovum in ovary Ie) “Stimulates follicle”

LH function in females LH stimulates the follicle cells (more specifically corpus luteum) to produce progesterone and estrogen

Progesterone Hormone Controls the secretory phase Stimulates maturation of the endometrium (inner lining of uterus) Breast development

Estrogen Hormone Controls proliferative phase Building of endometrium Stimulates the maturation of ovum as well Develops 2° sex characteristics Fat & hair distribution Growth of uterus & vagina Breast development

Estrogen Hormone When estrogen gets too high it creates a “-” feedback loop on anterior pituitary Causes a decrease in LH & FSH Ie) this is meant to prevent estrogen levels from getting too high

Estrogen Hormone Day 14, when the follicle matures and estrogen levels are the highest, there is a steep spike in LH (and also FSH) Believed that the significantly high level of estrogen creates a POSITIVE feedback on hypothalamus This causes the surge of LH (and FSH) = ovulation results

Corpus Luteum The remaining follicular tissue after ovulation Secretes progesterone & after a few days estrogen Progesterone stimulates the endometrium to mature and become secretory Estrogen stimulates continual thickening of endometrium wall This prepares the uterus for possible fertilization & pregnancy

Corpus Luteum Corpus luteum degenerates after 10 days if not pregnant This reduces the estrogen/ progesterone and the endometrium sheds as a result =menstruation Lasts ~5days and anterior pituitary begins releasing LH & FSH again Starts new cycle

Ovarian Cycle Phase (Time) Events Follicular Phase Day 1-13 (ripening of follicle) FSH & LH secreted by An Pit Maturation of follicle Secretion of estrogen/ progesterone to build endometrium Ovulation Day 14 Ovary releases ovum Corpus luteum formed Luteal Phase Day 15-28 (corpus luteum in ovary) Estrogen secreted by corpus luteum causing endometrium to continue to thicken Progesterone secreted by corpus luteum makes endometrium secretory

What happens in the ovarian phase causes the uterine phase

Uterine Cycle Phase (Time) Events Menstrual (Flow) Phase (shedding of endometrium) Day 1-5 Endometrium lining breaks down & is discharged = menstruation Proliferative Phase (rebuilding of uterine lining) Day 6-14 Rebuilding & thickening of endometrium Secretory Phase Day 15-28 Endometrium continues to thicken Maturation of secretory glands of endometrium

Key Ideas Hypothalamus and An Pit controls OVARY by secreting FSH & LH Ovary ripens egg & release on day 14 Ovary secretes estrogen/ progesterone OVARY controls UTERUS by way of estrogen/ progesterone

Ovarian & Uterine Cycle