mestrual cycle in humans
TRANSCRIPT
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The Menstrual Cycle
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What is the menstrual cycle? The process in which females ripen
or release one mature egg. The average menstrual cycle will
repeat itself about every 28 days, but normal menstrual cycles can range from 21 to 40 days.
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Changes in Pituitary Hormones Days 1-14: During the first half of the cycle
(Days 1-14) the pituitary produces FSH, which stimulates egg production.
This hormone also triggers the release of estrogen from the ovaries.
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Changes in Pituitary Hormones Days 14-28:
On the 14th day the pituitary begins releasing LH causing ovulation
LH also directs the production of progesterone which maintains the growth of the endometrium.
If the egg is not fertilized upon arrival in the uterus progesterone levels drop causing estrogen levels to drop leading to menstruation.
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Pituitary Hormones
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Changes in the Ovaries:
Stage 1 - ovum begins to develop.
Stage 2 - egg continues to ripen; follicle growth.
Stage 3 - Ovulation fully mature egg bursts out of follicle.
Stage 4 - Egg enters fallopian tube follicle remains and forms the corpus luteum.
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Changes in the Ovaries:
Stage 1 - An egg is beginning to mature within a cluster of cells called a follicle
Stage 2 - Rapid follicle and egg growth Stage 3 - Ovulation occurs; fully mature egg bursts out
of the follicle (fertile) empty follicle transforms into the corpus luteum
Stage 4 - Egg travels through fallopian tube (7 days) if not fertilized upon arrival in uterus the corpus luteum shrinks triggering menstruation and ripening of new egg.
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Changes in Ovarian Hormones: Estrogen -gradually increases during
days 1-14; signals body to thicken the lining of the uterus. Levels drop sharply after ovulation.
Progesterone -Levels remain low during the first half of the cycle and then increase sharplyduring the second half of the cycle. Maintaining the growth of the endometrium lining.
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Changes in the Uterus:
Stage 1- Day 1-5 menstruation
Stage 2 Day 5- 13 pre-ovulatory stage Stage 3 Day 14
Ovulation
Stage 4 Day 15-28 post-ovulatory
stage
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The uterine lining slowly thickens from day 5 through day 28
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Changes in the Uterus: Stage 1- Menstruation- Endometrium
breaks down and blood, mucus, tissue, and the egg are shed through the vagina.
Stage 2- Menstrual flow stops & endometrium begins to thicken.
Stage 3- Endometrium continues to thicken.
Stage 4- The endometrium is at it’s thickest point.
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Ovarian Hormones
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Days 1-14
Triggers uterine lining th ickening
ProducesEstrogen & Ovum
Triggers form ation of theFollicle
W ith in th e o va ry
ProducesFSH
F o llic le S tim u la tin g H o rm o ne
PituitaryG land
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Days 14 - 28
C ontinues uterine lining thickening
ProducesProgesterone
Triggers O vulationand the form ation of the
Corpus LutiumW ith in th e ovary
ProducesLH
L u tin iz in g H orm on e
PituitaryG land
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Breast Self ExamsMonthly check to detect changes
that could lead to breast cancer. Step One – “Look” In a mirror look for dimples,
puckering,redness of the breast skin, discharge from the nipples, or change in breast size or shape.
Step two – With flat fingers feel from top to bottom or in circles making sure to examine the entire breast.
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Common Complications of the Female Reproductive System Ovarian Cysts- Fluid filled sacs on the surface of
an ovary usually harmless; sometimes more serious. Symptoms include sudden severe abdominal pain, fever, vomiting.
Pelvic Inflammatory Disease- Infection leading to damage of the reproductive organs. If untreated may lead to chronic pain, infertility, and ectopic pregnancy
Breast Cancer- uncontrolled cell growth that invades surrounding tissue and destroys it.