powerpoint slides on fertilization
Post on 27-May-2015
18.889 Views
Preview:
DESCRIPTION
TRANSCRIPT
How are Babies Made?How are Babies Made?
Definition:Definition:Fertilisation is the fusion of the nuclei in a sperm and an egg to form a new life.
Fertilisation normally occurs during sexual intercourse.
What is Fertilisation???
What is Fertilisation???
sperm + egg = fertilised eggsperm + egg = fertilised egg
Fertilisation
Human life begins at fertilisation.
Fertilisation is the union of a sperm and anegg usually in the fallopian tube to
form a fertilised egg or zygote.
How are Babies Made?How are Babies Made?
uterusuterus
eggeggovaryovary
testistestis
fertilised eggfertilised egg
embryoembryo
uterusuterus
penispenis
vaginavagina
uterusuterus
bladderbladder
penis is inserted into the vagina
during sexual intercourse
penis is inserted into the vagina
during sexual intercourse
millions of sperm are released from the penis are are deposited in the vagina
millions of sperm are released from the penis are are deposited in the vagina
sperms swim from vagina up the uterus and into the
fallopian tubes; many sperms die before reaching
these tubes
sperms swim from vagina up the uterus and into the
fallopian tubes; many sperms die before reaching
these tubes
if a sperm meets an egg in a fallopian tube, fertilisation
takes place; only one sperm will fertilise the egg
if a sperm meets an egg in a fallopian tube, fertilisation
takes place; only one sperm will fertilise the egg
the fertilised egg/zygote begins to divide to form a small ball of cellsthe fertilised egg/zygote begins to divide to form a small ball of cells
the small ball of cells (now embryo) moves
down the fallopian tube and enters the uterus
the small ball of cells (now embryo) moves
down the fallopian tube and enters the uterus
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). – gestation period
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). – gestation period
During implantation, the embryo reaches the uterus and attaches itself onto the wall of the uterus.
Cell division continues.
During implantation, the embryo reaches the uterus and attaches itself onto the wall of the uterus.
Cell division continues.
First week
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
After the placenta develops in the wall of the uterus, the embryo joins to via an umbilical cord. The embryo receives
food and oxygen from the mother and pass waste substances back through the umbilical cord and placenta. The placenta also stops infections and
harmful substances from reaching the embryo. A surrounding liquid also
protects the embryo.
After the placenta develops in the wall of the uterus, the embryo joins to via an umbilical cord. The embryo receives
food and oxygen from the mother and pass waste substances back through the umbilical cord and placenta. The placenta also stops infections and
harmful substances from reaching the embryo. A surrounding liquid also
protects the embryo.
After 2 weeks
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
Eyes, arms and legs begin to form. A little tail is also visible.Eyes, arms and legs begin to
form. A little tail is also visible.
After 4 weeks
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
Nose, ears and fingers can be seen.Nose, ears and fingers can be seen.
After 7 weeks
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
Embryo looks like a baby. From this stage until birth, embryo is called a
foetus.
Embryo looks like a baby. From this stage until birth, embryo is called a
foetus.
After 11 weeks
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
The foetus looks more and more like a human baby. The fingers and toes
can be seen clearly.
The foetus looks more and more like a human baby. The fingers and toes
can be seen clearly.
After 20 weeks
A New Life is BornA New Life is Born
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).
After about 9 months, the baby is born.
After about 9 months, the baby is born.
After 38 weeks
A New Life is BornA New Life is Born When the baby is about to be born, the head of the baby faces down. Muscles in
the uterus push the baby down.
When the baby is about to be born, the head of the baby faces down. Muscles in
the uterus push the baby down.
muscles of uterus
muscles of uterus
The membrane around the foetus breaks and the liquid comes out.
The membrane around the foetus breaks and the liquid comes out.
membrane around the foetus
membrane around the foetus
Mother uses her muscles to push the baby out of the vagina. Baby comes out with the umbilical cord attached. Doctor cuts and
ties the cord. Placenta is released from the vagina as it is no longer needed.
Mother uses her muscles to push the baby out of the vagina. Baby comes out with the umbilical cord attached. Doctor cuts and
ties the cord. Placenta is released from the vagina as it is no longer needed.umbilical cordumbilical cord
placentaplacenta
vaginavagina
top related