Tissues, Levels of organization in Animals Video Lecture - NEET

hello friends this video on structural
organization of animals part one is
brought to you by exam Viacom no more
pure from exam is to be covered in this
lesson on animal tissues organ and organ
system heartworm
cockroach and frogs okay so in our
previous lesson we spend some time
understanding the morphology and anatomy
of plants so we looked at the external
features as well as the internal
features and characteristics of
different types of plants so here in
this lesson we are going to concentrate
on animals and when we talk about
animals as you can see on the screen a
lot of variety of them comes into our
mind starting from a small bacteria to
small insects to huge animals like
elephants even we human beings god dogs
so many aquatic fishes everything comes
to our mind when we think of animals so
now in this lesson we are going to talk
about the internal structure of these
animals now again in a similar way as we
did in case of plants in order to
understand the internal structure we
need to have a thorough understanding on
the composition or the basic composition
of animals now what is the basic
building block of our body this is
nothing but cell so we will spend some
time understanding what is a cell I mean
which we have already studied in our
class night what will sell water animal
cells what a plant cells we will
specifically talk in detail about the
different types of animal tissues so one
of the different type of tissues what
are their functions how do they look
like their structures so we'll spend
some time understanding that and once we
are clear with that we will talk about
the morphology and
of some of the animals because he in
animals it is like the variety is huge
so we just can't keep on talking about
each and every angle so we will talk
about three different types three
animals of different categories and we
will look at their structure in detail
so that is our agenda in this lesson so
let us start with the basics what are
tissues now as I said about cells you
all know right what is the cell what is
the difference between plant cell and
animal cell the structure and functions
of the different cell organelles all
those things are very much clear to you
if not you can refer the video on cell
of class night so that will help you to
get clarified with the basics so here we
will start with tissues so what are
tissues it is again a reputation I know
but just to give you a quick leap and
recap it is nothing but a group of cells
that are similar in structure or work
together to achieve a specific function
so their main agenda is this they work
together to achieve a common function so
some cells I mean if there are a hundred
cells in your body some tensions group
together to perform one function some
twenty cells group together perform the
second function again some 30 cells
group together perform a third function
so that grouping of cells to perform a
common function is then each such group
is known as a tissue now when we talk
about these shoes here you can see
examples of tissues here on the left
hand side you can see the lung tissue
our lungs they are made up of cells and
inside the lungs the cells group
together to perform some specific
function so the reasons how they look
like under microscope in other right
hand side you can see a black tissue now
quick question for you now that we have
already spoken about lung tissues in our
previous lesson just looking at this
picture can you tell which type of plant
tissue is this
a quick question based on our previous
lesson exactly this is nothing but
sclerenchyma
you remember Glenn timer the tough and
hard tissue which provides a lot of
rigidity to the plant right okay so we
know what our tissues now when you talk
of tissues this levels of organization
comes into picture because you have to
be very very clear about where tissue
stands in this level of organization
because in multicellular animals I mean
it once you send it to organisms rather
since there are so many cells inside the
body so the grouping has to be very
proper I mean the division of labor what
we call as that has to be very very
proper so for that a level has to be
maintained let us look at it again
because I know I have explained this
quite a number of times in our previous
chapters but still we'll have a quick
recap so that there is no confusion the
basic building block of any living
organism whether it is a unicellular or
multicellular whether it is plant or
animal or one a work so cell is the
basic building block so since here we
are talking about animals the picture
here you can see is an animal cell
with all the cell organelles inside it
these cells grouped together to form a
tissue for example the lung tissue which
I was just talking about so a male
inside that lung tissue there are many
cells which have grouped together then
they have decided to perform one
function now many such tissues will
group together to form an organ and what
is your organ organ is nothing like the
lungs lungs are the organs right these
are the orders which helping respiration
so there are many such organs in our
body right lungs and all the only organ
cloud we have lungs we have kidneys we
have stomach we have intestine there are
so many different organs which together
form organ system when I talk about
organ system here you think of some of
the organ systems which are present in
the human body when I talk about organ
systems we have the digestive system
shelters in digestion and absorption of
food we have the excretory system which
helps us to get rid of all the waste
products from our body we have the
respiratory system which helps in the
exchange of gases cellular respiration
so these organs together form one one
organ system for example here in this
picture you can see that the lung
tissues form lung and then the lungs
together form I mean not only lungs like
low clouds then you track here the
Broncos mouth pharynx all these organs
together form your respiratory system
correct and many such systems like the
respiratory system digestive system
circulatory system excrete the system
all this system together will form the
organism and what is the organism the
organism in this case is a human being
so this is our level of organization at
a basic building block starts with cell
but some of this then special a group
together to form tissues these tissues
again grouped together to form organs
organs to organ system and many such
organ systems together form an organism
now this hierarchy has to be maintained
for proper functioning of the
multicellular organism because he in
unicellular organism it is quite simple
because it is just one cell so you
cannot talk of division of labor you
cannot talk about some of the cells
getting grouped together and all those
stuff so nothing comes into picture
there is just one cell and that one cell
has to perform all the functions
starting from digestion starting from
ingestion that is intake of food
excretion blood circulation everything
has to be done by that particular cell
so we cannot talk of all these concepts
but when it comes to multicellular
organism there are so many cells that
you actually need a proper systematic
process for them to function like it is
the same example which I give all these
mixture to make you
understand it in the easier ways if you
have a class of 200 students and a
specific tasks need to be performed if
you don't divide the task amongst the
students what can happen it is a large
1/2 result and messy and at the end of
it it is the task will not be completed
at all because mainly that all those 200
students will end up doing the same task
right so that division of labor this
level of organization need to be
maintained it is very very important now
the question is still now we are talking
about tissues now are all tissue similar
or do we have different type of tissues
I mean when I talk about different type
of tissues again you might think ok in
our previous lesson we talked about the
different types of plant tissues now I
am NOT going to that level on a very
broader way like we see so many living
organisms plants animals so all of them
do they have same type of tissues well
very broadly we see that since there is
a lot of difference between a plant cell
and an animal cell therefore there is
again some difference between plant
tissues and animal tissues that is why
we keep them separate that is why we do
not mix up plant and animals if you see
we talk about morphological plant and
separate as a separate thing they can we
talk about plant tissues as a separate
thing we talk about animal tissues
animals morphologic animal Anatomy as a
separate thing because there is a
difference at the first level of
organization that is at the cellular
level the study itself is different in
case of plant and in case of animals so
we can say that no all the shoes are not
similar so it is exactly what you can
see here for example this is your plant
cell and this is your animal cell so
many different cells right for example
in a plant selves actual has a very
important role to play because of
storage of food very very important so
they generally have large wrapped roles
again in plant cell you have an
additional cell wall for their
protection which is missing and key you
solve for the animal cell like in plants
and you
you have one cell wall and you also have
a plasma membrane but in animals you
just have one layer for protection so
there aren't any such differences
between the two so based on that we also
talk about plant tissues and animal
tissues because of this reason we talk
about both of them separating now in our
previous lesson we have already spoken
in detail about plant tissues we have
looked at the different types of plant
tissues and their subtypes and we have
actually studied at Horry so in this
lesson we will be talking about the
animal tissues now before that let us
look at some of the basic differences
between plant tissues and animal tissues
when I talk about climate issues many of
the plant tissues are dead supportive
tissues to provide mechanical strength
of the best example is cladding Kaymer
right Skyrim fiber they are all dead
cells but they provide a lot of
mechanical strength because for plants
you need a lot of mechanical strength
right because they cannot move from one
place to another they will be static at
a place so if there is there remains
there are rains so there has to be some
mechanical strength to withstand all of
that growth limited to specific regions
so dividing tissues are localized in
those regions this we have discussed in
our previous lesson right growth when we
talk about growth we talk about the
growth in length we talked about the
meristematic tissue the apical meristem
we talked about the growth in width we
talked about the lateral meristem so
basically we do not see those
meristematic tissues present throughout
the plant right it is present only in
some specific regions and growth happens
only in those regions where as in case
of animals tissues mostly they are
living tissues except for maybe for few
exceptions but otherwise there are
living tissues growth is almost uniform
throughout so here you see in this
picture you can look at the difference
for example it was so small a kid when
he grows into an adult the growth
happens from everywhere his height
increases is
eight increases if you look at in spam
these fingers
so everything increases proportionately
right so we can say that the growth is
almost uniform throughout
but in these plants it does not look
like that for example it is only the
length which is increasing and the width
which is increasing other than that the
leaves and everything they will remain
the same their size will not increase
the size of leaf and all these things so
these were some of the differences
between plant tissues and animal tissues
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