Post on 06-Jan-2016
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The Menstrual and The Menstrual and Ovarian CyclesOvarian Cycles
Vocabulary- The Vocabulary- The HormonesHormones
Secreted by Pituitary:Secreted by Pituitary:–FSH (Follicle Stimulating Hormone)
Stimulates follicle to cause egg to mature
–LH (Luteinizing Hormone)
Causes release of mature ovum (ovulation)
Prepares uterus for implantation of fertilized egg
Vocabulary- The Vocabulary- The HormonesHormones
Secreted by Ovaries:Secreted by Ovaries:
–Estrogen
Causes uterine lining to thicken
–Progesterone:
Works with estrogen to finish uterine lining thickening
Vocabulary- The CyclesVocabulary- The Cycles
Ovarian Cycle:
–Occurs for 28 days in the ovaries
–Process during which an ovum matures in a follicle and is released during ovulation
–After ovulation, a corpus luteum (yellow body) is left behind
The Ovarian Cycle: YouTube video clip
Vocabulary- The CyclesVocabulary- The Cycles
Menstrual (Uterine) Cycle:–Occurs for 28 days–Process during which uterine lining
is preparing for fertilized ovum– If fertilization occurs, this cycle stops
until after birth– If not fertilized, lining sheds
(menstruation!) and cycle begins again
The Menstrual Cycle: The The Menstrual Cycle: The Video ClipVideo Clip
THESE TWO CYCLES THESE TWO CYCLES ARE GOING AT THE ARE GOING AT THE SAME TIME!!!!!!!!!!!!!!!!!!!SAME TIME!!!!!!!!!!!!!!!!!!!I REPEAT:I REPEAT: THESE THESE CYCLES RUN TOGETHER CYCLES RUN TOGETHER AT THE SAME TIME!AT THE SAME TIME!
What is going on all at What is going on all at once?once?
The Beginning and the End: The Beginning and the End: MenstruationMenstruation
Occurs if egg is not fertilizedDays 1- 5 Corpus luteum (yellow body) breaks down– This causes drop
in estrogen and progesterone
Uterine lining shedsFSH increases during
Phase 2: Follicular PhasePhase 2: Follicular Phase
Days 5 –13Low estrogen = FSH to be releasedThis stimulates growth of follicle– Egg begins to
matureFollicle matures causing estrogen levels up– Uterine lining
begins to thicken again
Phase 3: OvulationPhase 3: Ovulation
Days 13-15Sudden rush of FSHMajor SPIKE of LH– This causes
follicle to break and release egg into fallopian tube
FERTILIZATION MOST LIKELY TO OCCUR AT END OF OVULATION!
Phase 4: Luteal PhasePhase 4: Luteal Phase
Days 15-28LH and FSH levels crashCorpus luteum forms from broken follicleCorpus luteum secretes estrogen and progesterone– This thickens uterine
lining to prepare for egg