36.2.3 - Oogenesis / Ovarian cycle Flashcards

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1
Q

Function - Stimulating the follicle – Growth during the follicle phase

Produces / Releases - Anterior Pituitary

Stimulates Release - Negative Feed Back Loop -

Low Levels Estradiol

Peak - 0-13 Days

A

FSH - Follicle-stimulating Hormone

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2
Q

Function - Trigger Ovulation (release of mature egg from ovary) formation of corpus luteum

Produces / Releases - Anterior Pituitary

Stimulates Release - Negative Feed Back Loop -

Low Levels Estradiol

Peak - 0-13 Days

A

LH - Luteinizing hormone

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3
Q

Function - Follicle growth, Female Sex characteristics, Buildup of uterine lining

Produces / Releases - Cells in Follicle

Stimulates Release - Negative Feed Back Loop - Low Levels Estradiol (Buildup of uterine lining)

Positive feedback from rising estrogen levels (surge in GnRH and releases of LH)

Peak - Day Around day 13 (Just before ovulation occurs)

A

Estrogen / Estradiol

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4
Q

Function - Prepares uterine lining from fertilized egg and maintains corpus luteum

Produces / Releases - Corpus Luteum after ovulation

Stimulates Release - Rising LH levels during luteal phase

Peak - Luteal phase after ovulation

A

Progesterone

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5
Q

3 Phases of the Ovarian Cycle
(Slide 4)

A

Follicular
Ovulation
Luteal

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6
Q

Follicular

A

Negative Feedback suppressing LH and FSH (0-13 Days)

-Follicles in the Ovary begin to develop

-As they grow, more estrogen (estradiol) is released

-Sets Stage for ovulation

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7
Q

Luteal

A

Second half of menstrual cycle (15-20)

-Corpus Luteum forms (after ovulation) and secrete progesterone

-If fertilized corpus luteum is maintained / otherwise, it degrades (no fertilization)

The luteal phase supports early pregnancy (preparation for the next cycle)

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8
Q

Ovulation

A

Release of the oocyte into the fallopian tube (Around 13)

-Triggered by high Levels of LH

-Allows egg to become fertilized

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9
Q

High estrogen–positive feedback stimulates FSH and LH (luteal phase)

The hypothalamus is stimulated by high levels of estradiol (estrogen)

Precisely time ovulation allowing the egg to be fertilized (Increase the amount of LH / Surge to trigger ovulation)

ALLOWS HORMONE LEVELS TO FLUCATE

A

Feed Back Loop Positive

(Slide 5 / 7)

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10
Q

Progesterone - Estrogens = Negative Feedback

Low Estrogen – negative feedback suppressing LH and FSH (follicular phase)

The hypothalamus and Pituitary are inhibited by low levels of estradiol/progesterone.

Prevent overstimulation of ovaries

A

Feedback Loop Negative

(Slide 6 / 7)

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11
Q

If no pregnancy

A

The Corpus Luteum degenerates in 2nd half of the luteal phase.

Estrogen & Progesterone levels go down = shedding of uterine lining (menstrual period)

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12
Q

If pregnancy

A

Implants in the uterine lining

Embryo secrets HCF (human chorionic gonadotrophin

HCG stimulates the growth of the corpus luteum

Estrogen and Progesterone levels rise = growth of uterine lining and other pregnancy-related changes

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