Internal Fertilization in Humans - Reproduction in Animals, Science, Class

hello friends this video on the
production in animals part 13 is brought
to you by exam feel calm no more fear
from exam now if you talk about the
fertilization in human beings how it
happens in human beings here it happens
internal so the process is little
different so here the fertilization is
internal so what happens is it takes
place in the fallopian tube that's
because I told you before also the egg
which is produced by the ovary it's
released into the fallopian tube how it
comes to the fallopian tube because the
egg cannot move but it comes because the
fallopian tube has bought finger leg
structures here which pushes the egg
into the tube and that's how the egg
reaches the fallopian tube now during
intercourse the penis' releases the
spawns in the vagina and these forms
then need to travel the entire space
till it reaches the fallopian tube now
once the sperm reaches the value beyond
tube then the fusion will take it so the
fertilization takes place in the
fallopian tube so let's see how exactly
the process of fertilization takes place
so here what happens the over comes from
ovary to the fallopian tube so this is
the over it comes from the ovary into
the fallopian tube and what about this
form the spa was released into the
vagina during intercourse during
intercourse the pennies will release the
spawn through the unica in the vagina
now from vagina the swarm will travel
all through the uterus and it will
finally reach the fallopian tube so this
is where this formula so you see the
blue colored structure is the spawn so
this form will then fuse the egg how by
entering inside the egg now when the spa
men do
the egg we say that egg is 49 so now we
call this as a fertilized egg
so this is a fertilized egg now there
are several hindrances that might happen
now as I told you that when intercourse
takes place it's a few hundreds of
sperms are actually released in the
vagina
now imagine egg has to pass through so
much of distance it has to cross so much
of distance and sperms are also not very
strong so many of them die many of them
are not able to reach the value pain
tube itself so as a result very few of
them is able to reach the fallopian tube
now even if it has reached the fallopian
tube the timing has to be correct so
only if the egg has just been released
from the ovary and the egg is still
alive because once that is released from
the ovary
it will remain alive only for 24 hours
so if the timing at which the sperm has
reached the fallopian tube if that is
right that means if it has reached at
the right time when the egg is still
alive and it is able to enter inside the
egg only then fertilization take place
so there are so many ifs and buts
supposed to call many of those forms
will not be able to reach the fallopian
tube at all because it has to pass
through so much of distance so that is
one thing
many of the spawns might hang third many
a times the spot might reach the
fallopian tube but by the time it has
reached the fallopian tube the egg cell
is already dead
it is also possible that the egg cell is
alive but the sperm somehow could not
enter into the egg cell because in the
fallopian tube also nega suppose maybe
the sperm just remain here it could not
enter inside Excel so because of all
these ifs and buts the fertilization
which actually takes place that is very
rare it does death just doesn't happen
that since you have billions of sperm
all of them it will just enter inside
the female body and they will just
fertilize the egg
so that just doesn't happen so the
fertilization of the fusion of egg and
the spawn is a battle of chance so you
never know when exactly the fusion will
happen or when the fusion will not
happen
so if situations are good if luck
favours then this fusion happens between
the sperm and the ovum and we say that
fertilization has taken place so this is
how internal fertilization take place in
humans so now you might be interested to
know what happens after fertilization so
this 40 liest egg is nothing but the
zygote
so this is just a single cell which is I
got and this is I got Milton gradually
develop to form a small baby so you
might be interested to know about the
process after the formation of the
zygote and that's what we will do in the
next few slides let us see what happens
as a result of fertilization
fertilization is the fusion of the sperm
and the egg as a design what do we get
so far realization leads to the
formation of single cell as I got so
zygote is a single cell which is spawned
so this is let us say is iPod which is
made up of one cell now what happens to
this guy got this sigh God will then
undergo repeated division it will
undergo multiple divisions to form any
sense so this will undergo many
divisions multiple divisions and it will
form baby cells not only single thing
but multiple cell the structure will be
formed gradually with development this
is I got will form the embryo and this
embryo will go and fix itself in the
uterus now meanwhile what happens is so
this development takes place takes
around four to five days of time so
almost within a week from when
fertilization has taken place the embryo
goes and it gets settles in the uterus
no meanwhile when fertilization
the uterus prepares itself to receive
the embroider so how it repairs itself
it thickens its walls so we saw
fertilization happened as a result as I
got is formed which is why I said this
will undergo many more division to form
my people same structure as you can see
here so from one if one two then two
same structure then or cell structure
than a cell structure 16 same structure
so that's how it will become a multi
same structure eventually this is the
uterus so the uterus is preparing itself
how by thickening its walls so you see
these this is the wall of the uterus so
the wall of the uterus gets thickened so
that it can support the embryo saibra
will come and it will attach itself to
the wall of the uterus
and then gradually it will keep on
developing and the baby will grow and
the baby will remain there in the uterus
so the walls of the uterus should be
strong enough so that it can support the
baby for nine months now how exactly the
employer attaches itself to the uterus
now there is another structure which is
formed that is called a complete curl
god what does this umbilical cord so it
is a tube like structure which arises
from the abdomen of the embryo from this
embryos abdomen a tube like structure
will arise and this tube like structure
will connect to another structure called
placenta and placenta will connect to
the uterine wall of mother so basically
what's going to happen is now this
embryo is gradually growing so it needs
nutrients to grow so how will it get the
nutrients because the embryo is a small
it is not
ringing stops so happy to get its
nutrients from the mother's body because
the mother is eating food mother is
getting all the nutrients so that
nutrient will get transferred from
mother to the baby or to the embryo
through these structures while placenta
and umbilical cord now the total
development and that's how the
development of the embryo will continue
and the complete development will take
around 90 months during which all the
different organs will get develop and
you can that's why you would have seen
that when a lady is pregnant she often
goes for scan to doctors so when she
goes for Stan
so the first scan which is normally done
in after three months of pregnancy so
there she could only see the heart of
the baby because that is one organ which
develops during the initial stages but
gradually mentioned who goes for the
subsequent scans she can see the head
the hands the feet the fingers sometimes
even the eyelashes the hair everything
develops so over a period of time all
the different parts of the body will
gradually develop and finally when it is
fully developed then the baby is Danny
good outside of them out of the females
born so the connection here is how this
is how the implantation of the embryo
takes place in the uterus so this
settlement of the embryo in the uterus
is called embryo implantation because
that imply will get implanted in the
uterus so this is this is what happens
after fertilization so then arrival
descends into the uterus in four to five
days so here the zygote was formed so
from here to here
it takes four to five minutes so you see
how it actually move so once it is as I
thought and it keeps on dividing
multiple number of times but at the same
time it keeps on moving towards the
uterus so finally ready to each is the
uterus it connects to the wall of the
uterus through the complete cord and
placenta thank you please visit
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