menstrual cycle. interaction between the endocrine and reproductive systems. from the latin mensis...
DESCRIPTION
Defn: Controls (1) the development and release of an egg for fertilization and (2) the preparation of the uterus to receive a fertilized egg.TRANSCRIPT
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Menstrual Cycle
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Menstrual Cycle
• Interaction between the endocrine and reproductive systems.
• From the Latin “mensis” meaning “month”
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Defn:
• Controls (1) the development and release of an egg for fertilization and (2) the preparation of the uterus to receive a fertilized egg.
![Page 4: Menstrual Cycle. Interaction between the endocrine and reproductive systems. From the Latin mensis meaning month](https://reader035.vdocuments.mx/reader035/viewer/2022062504/5a4d1b7f7f8b9ab0599ba67a/html5/thumbnails/4.jpg)
Four stages
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1. Follicle phase (~Day 5 - Day 13)
• Pituitary hormones FSH and LH travel to the ovaries where they cause a follicle to develop.
• As follicle develops it produces increased amounts of estrogen. This prepares the endometrium.
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2. Ovulation (~Day 14)
• Shortest phase.
• 3 - 4 days
• Sudden rush of FSH and LH causes the follicle to rupture and release the ovum.
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3. Luteal Phase (~Day 15-28)
• CL continues to produce estrogen and begins to produce progesterone.
• Progesterone increases the blood supply to the endometrium and fully prepares it.– If fertilization takes place - zygote
divides several times and implants in the endometrium.
– CL continues to function for several weeks.
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4. Menstruation (~Day 1 - 4)
• If no fertilizatoion…
– egg does not implant– CL begins to disintegrate– levels of progesterone an estrogen
fall
• lining of uterus detaches along with blood and unfertilized ovum is discharged.
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Menstrual Hormones
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Menstrual Hormones
Hormone Source Effect
FSH Pituitary Maturation offollicles
LH Pituitary Ovulation
Estrogen FollicleCorpus luteum
Thickens theendometrium
Progesterone Corpus luteum Maintainsendometrium
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