Post on 28-Sep-2020
transcript
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Female Reproductive
System
1. Ovaries • 2 organs: 1 on either side of
the uterus; walnut size.
• Produce hormones
(estrogen, progesterone)
•Produce eggs (ova) that dev.
& mature in the follicles of
the ovaries.
2. Fallopian
tubes (oviduct)
3. Uterus
a tube that guides egg into
the uterus by muscular
contractions & cilia
the womb where the zygote
implants & embryo develops
into a fetus
1. Ovaries• 2 organs; walnut size.
• Produce hormones
(estrogen, progesterone)
• stimulates follicles to
mature the egg (ova) inside
the ovaries.
2. Fallopian
tubes (oviduct)
3. Uterus
a tube that guides egg into
the uterus by muscular
contractions
the womb where the zygote
implants & embryo develops
into a fetus
Female Reproductive System
5. Vagina tube where sperm is
deposited; opening to
outside of body
Only 1 egg is released at a time.
4. Cervix narrow neck of the
uterus
Female Reproductive Organs
• Cervix
2
At
Ovulation
At
Fertilization
At birth(prophase)
Female Menstrual Cycle
•Monthly cycle (every 28 days), Day 1
starts with menstruation.
• Begins at puberty, stops during
pregnancy, ends at age 45-50 called
menopause.
• At birth, women have 400-500 oocytes.
•Hormones controlled by negative feedback
mechanism.
Hormones: Ovarian & Menstrual Cycle
Pituitary Gland Ovary
1. FSH
• stimulate egg to
mature in ovary
2. LH
• stimulate egg to
release it from ovary
• forms corpus luteum
1. Estrogen
• initially builds uterus
lining with blood
vessels
2. Progesterone
• continues to build up
uterus lining with
blood vessels
OvaryPathway
For An
Egg
Vagina
Uterus
Fallopian tube(oviduct)
3
Website Animation:
Menstrual Feedback Mechanism
• http://www.msnbc.com/news/wld/graphics/m
enstrual_cycle_dw.htm
(animation) ****
• http://wps.aw.com/bc_martini_eap_4/0,11295,
2680298-content,00.html (animation)****
Menstrual Cycle Stages
1. Follicle Stage lasts 10 days
- follicles & egg grow
- estrogen released when follicle breaks open
- estrogen thickens uterus lining (more blood vessels)
2. Ovulation lasts 1 day
- egg released from ovary by LH
3. Corpus Luteum (Luteal Stage) lasts 12 days- remaining follicles turn into the corpus luteum
caused by LH
- turns yellow & makes progesterone to maintain
pregnancy
4. Menstrual Stage lasts 3-5 days
- If No pregnancy………
- Estrogen & progesterone decrease
- Uterus lining & unfertilized egg sheds
What Happens In The
Ovaries?
Follicular Stage
Ovulation
Corpus Luteum Stage
4
FSH causes
dev. of
follicle
LH causes (rupture)
LH causes dev.
Drop in LH, estrogen,
progesterone
Makes
progesterone What Happens In The
Menstrual Stage
?
2.
3.
Estrogen &
progesterone
are high to
thicken uterus
lining for
pregnancy.
Uterine lining &
unfertilized egg
are shed during
No pregnancy,
Estrogen &
Progesterone
levels drop !
Menstruation
Uterus lining LH
FSH
Pituitary gland
Uterus
Progesterone
Estrogen
Egg travels
Review Questions
5
Questions ?
1. How long does the ovarian & menstrual cycle lasts?
?
Usually 28 days
2. When does meiosis I begin?
At ovulation
3. When does meiosis II begin?
At fertilization
Questions ?
4. What hormone causes the release of a mature egg, also called ovulation?
?
LH (luteinizing hormone)
5. Name 2 hormones that directly effect the
uterus lining of the uterus?
Estrogen & Progesterone
Questions ?
6. What hormone causes the development of the follicles surrounding the egg?
?
FSH (Follicle stimulating hormones)
7. Name the 2 hormones made in the
ovaries?
Estrogen & Progesterone
Questions ?
8. What hormones do the corpus luteum produce?
?
Estrogen and Progesterone
9. Menstruation results due to the hormones
increasing or decreasing?
Decreasing