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Engineering HSC and IIT-JEE mains and
advanced videos. Hello students today we
are studying chapter study of Animal
Tissue in that we are starting topic
Epithelial Tissues.
Now when I say Epi it means above MLS
Ethereal it means that grows above the
surface the tissue that's placed on a
skin is Epithelial  let's study a little
bit more about it.
epithelial tissue now once we come
across a tickler to show a simple
example that I could give you is the
tissue that's present on your skin it's
Epithelial Tissue the Tissue that does
not allows the entry of your lotions
cream oil raindrops which follow your
skin or even water inside your body
that's a Epithelial Tisssue
so basically epithelial tissue in
general forms the covering of external
as well as internal surfaces of your
body for example your heart your stomach
your liver is covered by a thin membrane
of epithelial tissue yes it has
different kinds of epithelial tissue
that's that are present on this coupling
is not a same type the cells of you
epithelial tissue if you see up close
feedback and if the sense of closely
packed there will be very little space
available in those cells also there is a
similar substance or a semen kind of
substance present between them and that
sound as matrix the cells basically lie
on a basement membrane if you observe
this article as it shows on a microscope
now depending upon epithelial tissues
can be divided into three different
types on the junctional complexes and
those types are the tight Junction
complexes further into Junction
complexes and gap Junction complexes now
tight Junction complexes you're correct
it prevents leakage anything where tight
ends in context a present cannot link
learning Junction complexes help in the
joining of two different cells whereas
gap Junction complexes of epithelial
tissues and in the movement of
biomolecules
epithelial tissue now epithelial tissue
is the tissue that it's present on your
skin
epi means up or Antillean means it's
going up or it falls the covering for
external as well as internal surfaces of
your body and as the internal surfaces
it could be your stomach your ribcage
different kinds of epithelium are
present on their surfaces now cells and
epithelial to show up basically closely
packed also there will be little space
available between the cells and thus
emitting substance or you can say a
substance that acts as a glue between
the cells is your matrix the cells
basically rest on a basement kind of a
membrane
now between epithelial cells what do you
really observe is other three types of
functional complexes and now this thing
that's of junctional complexes are your
tight junctions editor injunctions and
gap junctions now firstly what a tight
Junction eye junctions are nothing but
layers of epithelial cell which actually
prevent leakage of a substance they
don't I love certain molecules that are
present inside epithelial cells to move
out or move out other injunction now
many talk about that word unholy but how
do you mean something that stick around
our injunctions are basically with
cement or simple language which allow to
stick the adjoining cells by a substance
made up of carbohydrate derivative and
now this cargo had the derivative could
be a disaccharide or sometimes a
polysaccharide depending upon the source
of the plan for example in some clients
moody plants it is chitin in other
plants this could be starch also and
lastly your gap junctions now if I talk
about gap junctions they allow the
movement of ions and now this ions could
be sodium potassium magnesium calcium
anything of this and bad molecules
between adjoining cells now ions
basically won't be moving in and out of
the cells for example sodium and
potassium pumps which are present just
around the cells allow the ions to move
depending upon the electric current
that's flowing and how the ions are
exchanged between the cells also the
phospholipid bilayer or the fat layer
around the cell also will provide
support to the gap Junction whenever
there is an exchange between the ion
molecules under the maneuver there is an
exchange between the surfaces for ion
derivatives so students in this part of
the chapter we did study about
epithelial tissue what is a structure
what's the origin and what are the
different types of junctions present in
I hope you're very clear about this
concept thank you
