Class 9 Exam > Class 9 Videos > Epithelial tissues types - Biology Tissues, Force & Laws of Motion, Science, Class 9
Epithelial tissues types - Biology Tissues, Force & Laws of Motion, Science, Class 9 Video Lecture
FAQs on Epithelial tissues types - Biology Tissues, Force & Laws of Motion, Science, Class 9 Video Lecture
| 1. What are the different types of epithelial tissues? |  |
Ans. Epithelial tissues are classified into different types based on their structure and function. The four main types of epithelial tissues are:
1. Squamous epithelium: This type of tissue consists of flattened cells that form a thin, smooth layer. It is found in the lining of blood vessels, lungs, and body cavities.
2. Cuboidal epithelium: The cells in this tissue are cube-shaped and form a layer of glandular tissue. It is found in the kidneys, salivary glands, and pancreas.
3. Columnar epithelium: These cells are elongated and rectangular in shape. They form a protective layer and are found in the lining of the intestines, stomach, and respiratory tract.
4. Transitional epithelium: This type of tissue is able to stretch and change shape. It lines the bladder, ureters, and urethra.
| 2. What is the function of epithelial tissues? | |
Ans. Epithelial tissues have several important functions in the body, including:
1. Protection: Epithelial tissues act as a barrier, protecting the underlying tissues from injury, infection, and dehydration.
2. Absorption: Some epithelial tissues have specialized cells that are responsible for absorbing nutrients, ions, and other substances from the surrounding environment.
3. Secretion: Certain epithelial tissues have glandular cells that produce and release substances such as hormones, enzymes, and mucus.
4. Sensation: Epithelial tissues contain specialized cells that are involved in the detection of sensory stimuli, such as touch, taste, and smell.
5. Excretion: Epithelial tissues play a role in excreting waste products from the body, such as urine and sweat.
| 3. Where can squamous epithelium be found in the body? | |
Ans. Squamous epithelium can be found in various parts of the body, including:
1. Lining of blood vessels: Squamous epithelium lines the inner walls of blood vessels, providing a smooth surface for the flow of blood.
2. Lungs: The alveoli in the lungs are lined with squamous epithelium, allowing for efficient gas exchange between the air and bloodstream.
3. Body cavities: Squamous epithelium lines the body cavities, such as the peritoneal cavity and pleural cavity, providing a protective barrier.
4. Skin: The outermost layer of the skin, known as the epidermis, is composed of squamous epithelial cells.
| 4. What is the function of cuboidal epithelium? | |
Ans. Cuboidal epithelium has several important functions in the body, including:
1. Secretion: Cuboidal epithelial cells are involved in the production and release of various substances, such as enzymes, hormones, and sweat.
2. Absorption: Certain cuboidal epithelial cells have microvilli or other specialized structures that increase their surface area for absorption of nutrients, ions, and other substances.
3. Filtration: In the kidneys, cuboidal epithelial cells form specialized structures called renal tubules, which are involved in the filtration of waste products and reabsorption of essential substances.
4. Protection: Cuboidal epithelium lines and protects various glands in the body, such as the salivary glands, pancreas, and thyroid gland.
| 5. Where can columnar epithelium be found in the body? | |
Ans. Columnar epithelium can be found in different parts of the body, including:
1. Lining of the intestines: The gastrointestinal tract is lined with columnar epithelium, which is involved in the absorption of nutrients from digested food.
2. Stomach: The inner lining of the stomach is composed of columnar epithelial cells, which secrete digestive enzymes and absorb nutrients.
3. Respiratory tract: The respiratory tract, including the trachea and bronchi, is lined with columnar epithelium, which helps to trap and remove foreign particles from the air.
4. Fallopian tubes: The fallopian tubes in females are lined with columnar epithelium, which facilitates the movement of eggs towards the uterus.
Text Transcript from Video
hello friends this video on tissues
pac-10 is brought to you by exam furor
calm no more fear from exam so now let
us start our discussion on stratified
educator
now once you have understood the simple
epithelium understanding the stratified
epithelium becomes little easy so what
is a stratified epithelium and epic
video which has many layers a year in
simple epithelium we had a single layer
of cells but now we have multiple layers
of sense right so here also again it has
the same three types let us the
stratified squamous stratified cuboidal
and pseudostratified columnar now you
must be wondering why do we have this
extra word pseudo here because
stratified qalam that is often seen as
pseudo stratified columnar that means it
is not actually stratified but it looks
like stratified the words you do what
does it means means false that means
something which appear something but it
is actually something else that is the
meaning of pseudo right so
pseudostratified columnar means it looks
stratified but it is not actually
stratified that means it looks as if it
is made up of many layers but actually
it is made up of us in the layer that is
the middle of pseudo stratified so we
will discuss each of them one by one so
let us start with stratified squamous
epithelium so again stratified means
many layers squamous will still mean the
same that means thin flat plate like
structures so now we can say that these
are multiple layers of thin flat plate
like structures so the same simple
squamous epithelium when arranged in
many layers forms stratified squamous
epithelium now you might think that when
we already have simple squamous
epithelium what was the need of having
this stratified squamous epithelium well
we have not designed all this things
right
these were all already designed inside
the body right so how did we what people
did was they just observed them they did
lot of studies on them and then they
discovered
that organ these are the things which
are present now when you would start
justifying that why this was pleasant
why that was present you get many
answers to many of your questions so now
the question was when we had simple
squamous epithelium inside our body what
was the need of the stratified squamous
what is the extra advantage that we get
because of this additional layers think
yourself this extra additional layer
will ensure better protection because
earlier you had just one layer of thin
flat structure so that one layer itself
were so delicate that it was not able to
offer any protection but now when you
have those kind of delicate layers
instead of one if now you have hundred
layers that means you are actually
getting a kind of cushion so now you can
ensure better protection so these
multiple layers ensured better
protection to the underlying tissue so
where do we actually found it we found
it skin to prevent wear and tear so
outer layer of skin has the simple
squamous epithelium but if you look deep
inside the skin it is made up of
stratified squamous epithelium that
means it has multiple layers because he
needs a lot more protection because it
is subject to wear and tear the skin is
the exposed two part right so many times
we get hurt we get stuck somewhere so
the skin is exposed to all kind of
external hazards so it in order to
prevent the wear and tear the stratified
squamous epithelium is present inside
the skin now let us talk about the
stratified cuboidal epithelium so in a
similar way it is a multiple layer of
cube-shaped sales so now here you see
the same simple cuboidal epithelium is
now arranged in multiple stacks so this
also ensures more protection and simple
cuboidal however specialize in
separation so they are also those simple
cuboidal epithelium was specialized for
secretion it was present in the
secretory glands so here also to ensure
it specializes and
but ensures little more protection so we
found it in sweat glands so these kind
of epithelium are found in sweat glands
so why do we find these data why don't
we find why do we find simple cuboidal
epithelium in saliva glands but we find
stratified cuboidal epithelium in sweat
glands that's because when I talk of the
saliva glands they don't need much of a
protection because they are already
present somewhere inside but when I am
talking about the sweat glands they are
again exposed they are being found in
the exposed areas so they need little
more protection so in order to ensure
that extra protection stratified
cuboidal epithelium is found in sweat
glands now there's a stalk about the
pseudostratified columnar epithelium so
what does this pseudo strap affect
something which look stratified but
actually it is not so looks like
stratified but it is actually not so if
you look at this picture by looking at
this picture at once you will feel that
it is made up of multiple layers but
actually it is made up of a single layer
if you look at it closely you will see
that this is one cell this is another
cell this is third cell this is fourth
cell so it is just one here but the only
thing is that here the cells are of
different sizes now since they're of
different sizes that is why they appear
as if they are in different layers so
single layer of tall pillar-like cells
of different heights which make it
appear stratified so the this difference
in heights of the columnar cells the
palenik cells which are of different
heights because of their different
heights
they look like stratified it appears as
if they are present in multiple layers
so they contain mucous secreting cells
called goblet cells so they contain this
special type of cells these pseudo
stratified columnar epithelium they
contain the special kind of cells which
secrete mucus we just now talked about
talked about mucus it is a fluid like
slippery substance so these cells
secrete the goblet cells which secrete
mucus are present in the pseudo
stratified
not epic here now there are two types of
pseudostratified columnar epithelium one
is ciliated and the other one is low and
ciliated ciliated means it has Syria
that is the hair like structures which I
was talking about
so the sealy ated pseudostratified
columnar epithelium is generally found
in the upper or lower respiratory tract
because Syria plays an important role in
the respiratory tract
whereas non ciliated pseudostratified
epithelium is found in the male urethra
because main juditha is neither organ
which secretes mucus so in the main when
you study the main reproductive system
you see that the male urethra secretes
this mucus which again please a very
important role in reproduction right so
there we do not need there is no not
much role of Celia right so do the non
ciliated pseudostratified epithelium is
found in male urethra
whereas the CV ated pseudostratified
columnar epithelium is found in the
respiratory tract so with this I think
we have discussed all the different
types of epithelial tissue and I hope
that you have understood what is an
epithelial tissue what are the functions
of epithelial tissue where do we find
epithelial tissue what are the different
types of epithelial tissue and where
each of those types of epithelial
tissues are found and won right so with
this I will quickly discuss about the
different types of epithelial tissue
which are present in different parts of
the body with this diagram so that will
become a kind of review of whatever we
have studied so far so here if you see
at the mouth what do you have what kind
of epithelium do you have at mouth and
skin so when I see mouth and skin I have
stratified squamous epithelium right
stratified squamous in skin and mount
correct so where do we have simple
squamous epithelium in the linings of
the blood vessels maybe
around the heart you have the blood
vessels where you have simple squamous
epithelium so they are present in lining
of blood vessels where else do you have
you will have it in the air sacs of
lungs so in the air sacs of lungs also
you will have simple squamous right so
simple squamous and simple and
stratified squamous is done now simple
cuboidal where do we have simple
cuboidal we have it in the lines of
kidney tubules so maybe somewhere in the
kidney tubules we have simple cuboidal
where else we also have it in the glands
where do we have stratified cuboidal
stratified cuboidal are present in the
sweat glands so sweat glands will have
stratified cuboidal now comes the turn
of simple column not so where do we have
simple column not in the digestive
system so this is displaying the
interesting actually so in the digestive
organs so the digestive organs will have
the simple columnar epithelium simple
columnar epithelium right where do we
have stratified columnar epithelium so
the stratified columnar epithelium will
be present in the male urethra so the
male urethra will have the stratified
columnar epithelium right so these are
some of the different types of
epithelium which are present in our
different body parts so I hope with this
you would have understood what this
epithelial tissue what are the functions
that an epithelial tissue should perform
why do we have epithelial tissue at all
and the different types of epithelial
tissue so with this we will end our
discussion on epithelial tissue and we
will start
with an X type of issue that is
connective tissue thank you please visit
www.payoor.com
to watch more videos attempt free online
test
get free study material find tutors and
mentors thank you once again
pac-10 is brought to you by exam furor
calm no more fear from exam so now let
us start our discussion on stratified
educator
now once you have understood the simple
epithelium understanding the stratified
epithelium becomes little easy so what
is a stratified epithelium and epic
video which has many layers a year in
simple epithelium we had a single layer
of cells but now we have multiple layers
of sense right so here also again it has
the same three types let us the
stratified squamous stratified cuboidal
and pseudostratified columnar now you
must be wondering why do we have this
extra word pseudo here because
stratified qalam that is often seen as
pseudo stratified columnar that means it
is not actually stratified but it looks
like stratified the words you do what
does it means means false that means
something which appear something but it
is actually something else that is the
meaning of pseudo right so
pseudostratified columnar means it looks
stratified but it is not actually
stratified that means it looks as if it
is made up of many layers but actually
it is made up of us in the layer that is
the middle of pseudo stratified so we
will discuss each of them one by one so
let us start with stratified squamous
epithelium so again stratified means
many layers squamous will still mean the
same that means thin flat plate like
structures so now we can say that these
are multiple layers of thin flat plate
like structures so the same simple
squamous epithelium when arranged in
many layers forms stratified squamous
epithelium now you might think that when
we already have simple squamous
epithelium what was the need of having
this stratified squamous epithelium well
we have not designed all this things
right
these were all already designed inside
the body right so how did we what people
did was they just observed them they did
lot of studies on them and then they
discovered
that organ these are the things which
are present now when you would start
justifying that why this was pleasant
why that was present you get many
answers to many of your questions so now
the question was when we had simple
squamous epithelium inside our body what
was the need of the stratified squamous
what is the extra advantage that we get
because of this additional layers think
yourself this extra additional layer
will ensure better protection because
earlier you had just one layer of thin
flat structure so that one layer itself
were so delicate that it was not able to
offer any protection but now when you
have those kind of delicate layers
instead of one if now you have hundred
layers that means you are actually
getting a kind of cushion so now you can
ensure better protection so these
multiple layers ensured better
protection to the underlying tissue so
where do we actually found it we found
it skin to prevent wear and tear so
outer layer of skin has the simple
squamous epithelium but if you look deep
inside the skin it is made up of
stratified squamous epithelium that
means it has multiple layers because he
needs a lot more protection because it
is subject to wear and tear the skin is
the exposed two part right so many times
we get hurt we get stuck somewhere so
the skin is exposed to all kind of
external hazards so it in order to
prevent the wear and tear the stratified
squamous epithelium is present inside
the skin now let us talk about the
stratified cuboidal epithelium so in a
similar way it is a multiple layer of
cube-shaped sales so now here you see
the same simple cuboidal epithelium is
now arranged in multiple stacks so this
also ensures more protection and simple
cuboidal however specialize in
separation so they are also those simple
cuboidal epithelium was specialized for
secretion it was present in the
secretory glands so here also to ensure
it specializes and
but ensures little more protection so we
found it in sweat glands so these kind
of epithelium are found in sweat glands
so why do we find these data why don't
we find why do we find simple cuboidal
epithelium in saliva glands but we find
stratified cuboidal epithelium in sweat
glands that's because when I talk of the
saliva glands they don't need much of a
protection because they are already
present somewhere inside but when I am
talking about the sweat glands they are
again exposed they are being found in
the exposed areas so they need little
more protection so in order to ensure
that extra protection stratified
cuboidal epithelium is found in sweat
glands now there's a stalk about the
pseudostratified columnar epithelium so
what does this pseudo strap affect
something which look stratified but
actually it is not so looks like
stratified but it is actually not so if
you look at this picture by looking at
this picture at once you will feel that
it is made up of multiple layers but
actually it is made up of a single layer
if you look at it closely you will see
that this is one cell this is another
cell this is third cell this is fourth
cell so it is just one here but the only
thing is that here the cells are of
different sizes now since they're of
different sizes that is why they appear
as if they are in different layers so
single layer of tall pillar-like cells
of different heights which make it
appear stratified so the this difference
in heights of the columnar cells the
palenik cells which are of different
heights because of their different
heights
they look like stratified it appears as
if they are present in multiple layers
so they contain mucous secreting cells
called goblet cells so they contain this
special type of cells these pseudo
stratified columnar epithelium they
contain the special kind of cells which
secrete mucus we just now talked about
talked about mucus it is a fluid like
slippery substance so these cells
secrete the goblet cells which secrete
mucus are present in the pseudo
stratified
not epic here now there are two types of
pseudostratified columnar epithelium one
is ciliated and the other one is low and
ciliated ciliated means it has Syria
that is the hair like structures which I
was talking about
so the sealy ated pseudostratified
columnar epithelium is generally found
in the upper or lower respiratory tract
because Syria plays an important role in
the respiratory tract
whereas non ciliated pseudostratified
epithelium is found in the male urethra
because main juditha is neither organ
which secretes mucus so in the main when
you study the main reproductive system
you see that the male urethra secretes
this mucus which again please a very
important role in reproduction right so
there we do not need there is no not
much role of Celia right so do the non
ciliated pseudostratified epithelium is
found in male urethra
whereas the CV ated pseudostratified
columnar epithelium is found in the
respiratory tract so with this I think
we have discussed all the different
types of epithelial tissue and I hope
that you have understood what is an
epithelial tissue what are the functions
of epithelial tissue where do we find
epithelial tissue what are the different
types of epithelial tissue and where
each of those types of epithelial
tissues are found and won right so with
this I will quickly discuss about the
different types of epithelial tissue
which are present in different parts of
the body with this diagram so that will
become a kind of review of whatever we
have studied so far so here if you see
at the mouth what do you have what kind
of epithelium do you have at mouth and
skin so when I see mouth and skin I have
stratified squamous epithelium right
stratified squamous in skin and mount
correct so where do we have simple
squamous epithelium in the linings of
the blood vessels maybe
around the heart you have the blood
vessels where you have simple squamous
epithelium so they are present in lining
of blood vessels where else do you have
you will have it in the air sacs of
lungs so in the air sacs of lungs also
you will have simple squamous right so
simple squamous and simple and
stratified squamous is done now simple
cuboidal where do we have simple
cuboidal we have it in the lines of
kidney tubules so maybe somewhere in the
kidney tubules we have simple cuboidal
where else we also have it in the glands
where do we have stratified cuboidal
stratified cuboidal are present in the
sweat glands so sweat glands will have
stratified cuboidal now comes the turn
of simple column not so where do we have
simple column not in the digestive
system so this is displaying the
interesting actually so in the digestive
organs so the digestive organs will have
the simple columnar epithelium simple
columnar epithelium right where do we
have stratified columnar epithelium so
the stratified columnar epithelium will
be present in the male urethra so the
male urethra will have the stratified
columnar epithelium right so these are
some of the different types of
epithelium which are present in our
different body parts so I hope with this
you would have understood what this
epithelial tissue what are the functions
that an epithelial tissue should perform
why do we have epithelial tissue at all
and the different types of epithelial
tissue so with this we will end our
discussion on epithelial tissue and we
will start
with an X type of issue that is
connective tissue thank you please visit
www.payoor.com
to watch more videos attempt free online
test
get free study material find tutors and
mentors thank you once again
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