Class 12 presentation

1. MENSTRUAL
CYCLE
FERTILISATIO
N AND
IMPLANTATIO
N
MADE BY - AMITA RANJAN
XIITH SCIENCE (BIOLOGY)

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The process in a woman of discharging
blood and other material from the lining of
the uterus at intervals of about one lunar
month (28 days) from puberty until the
menopause , except during pregnancy

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it
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PHASES OF MENSTRUAL CYCLE

4. Begins when estrogen levels are
low.
Anterior pituitary secretes FSH and
LH , stimulation follicle to develop.
 Cells around egg enlarge, releasing
estrogen.
This causes this uterine lining to
thicken.
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LH and FSH still being released, for
another 3-4days.
Follicle ruptures, releasing ova into
the Fallopian tubes.
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Now empty follicle changesto ayellow colour,
becomescorpusluteum.
Continuesto secrete estrogen, but now beings
toreleaseprogesterone.
Progesterone further developsuterine
lining.
If pregnant, embryo will release
hormones topreserve corpus luteum
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7. MENSTRUATION
If no embryo, the corpus luteum begins
to disintegrate.
Progesterone levels drop, uterine
lining detaches, menstruation can
begin.
Tissue, blood, unfertilized egg all
discharged.
Can take from 3-7 days.

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AN OVERVIEW TO MENSTRUAL CYCLE
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Table
Lorem ipsum dolor sit amet,
consectetur adipiscing elit.
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HORMONAL CONTROL OF MENSTRUAL
CYCLE

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FERTILISATION
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11. MAJOR EVENTS
OF
FERTILISATION
Fertilisation refers to the
fusion of the egg(ovum) and
sperm and usually takes
place in the upper third of the
fallopian tube.

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FERTILISATION AND IMPLANTATION
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IMPLANTATION
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THANK YOU FOR
WATCHING
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