The Menstrual and Ovarian Cycles

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Presentation transcript:

The Menstrual and Ovarian Cycles

Vocabulary- The Hormones 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 Hormones Secreted by Ovaries: Estrogen Causes uterine lining to thicken Progesterone: Works with estrogen to finish uterine lining thickening

Vocabulary- 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 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 Video Clip

THESE TWO CYCLES ARE GOING AT THE SAME TIME!!!!!!!!!!!!!!!!!!! I REPEAT: THESE CYCLES RUN TOGETHER AT THE SAME TIME!

What is going on all at once?

The Beginning and the End: Menstruation Occurs if egg is not fertilized Days 1- 5 Corpus luteum (yellow body) breaks down This causes drop in estrogen and progesterone Uterine lining sheds FSH increases during

Phase 2: Follicular Phase Days 5 –13 Low estrogen = FSH to be released This stimulates growth of follicle Egg begins to mature Follicle matures causing estrogen levels up Uterine lining begins to thicken again

Phase 3: Ovulation Days 13-15 Sudden rush of FSH Major 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 Phase Days 15-28 LH and FSH levels crash Corpus luteum forms from broken follicle Corpus luteum secretes estrogen and progesterone This thickens uterine lining to prepare for egg