Hormones Group, Receptors Video Lecture | Biology for Grade 11

hello friends this video on chemical
coordination and integration part 17 is
brought to you by exam fire comm no more
fear from example let us now look at the
mechanism of hormone action that is how
exactly the hormone acts inside our body
now I had actually given you a brief
introduction to how I caught on acts in
our body now in order to understand it
more clearly let us first try to
understand what are the different groups
of hormones which are present inside our
body we saw many different hormones we
talked about the thyroid hormones them
and drinketh hormones the party coins so
many hormones we spoke about now if you
consider all the world ones they can be
divided into four groups the protein
hormones or the peptide hormones steroid
hormones thyroid hormones and the amino
acid derivatives so these are the four
classes into which all the types of
hormones can be grouped so I have to say
protein hormones obviously they will
have some protein structures so examples
of protein organs would be the
glycoproteins which are secreted from
the anterior pituitary or it could be
the pancreatic hormones now we spoke
about the islet of Langerhans right in
Sweden glucagon so they are all the
pancreatic hormones so they are also
protein models now why are they divided
into these four classes based on their
structure
now those hormones whose structures are
similar to the proteins or which contain
a lot of the kinds so they are protein
or peptide hormones similarly those who
are words which have cholesterol group
with them they will be steroid so those
which have something which have some
amino acid in them they will be an amino
acid daily value so that means based
upon their structure they have been
grouped under these classes so in the
protein hormones the digestive tract
hormones will also fall under this now
examples of some of the protein hormones
would be insulin glucagon thyroid
stimulating
luteinizing hormone follicle-stimulating
one when they all fall under the
category of the protein hormone let us
look at the steroid hormone
these are those hormones which are
derived from cholesterol right so
cholesterol are what they are they have
they fall into the category of facts so
examples of such orders would be
cortisol which is a corticoid
testosterone progesterone which are the
male and the female of the hormones
secreted by the testes and the openings
respectively thyroid hormones examples
of thyroid hormones would be idle Tyrone
bees so they have the thyromine
group with them and also IUDs so the t3
t4 hormones they fall into the category
of thyroid hormones now these Cairo
hormones are also derivative of amino
acid however they are not directly
derivative of a manual I said that is
why they have been grouped separately
but otherwise it in some of the
textbooks you will see that Tiger
hormones have been put under a - a
derivative because they are also a
relative of an amino acid in that oj m-i
acid derivatives they are derived from
their my acid ty Wilson
so this tyrosine is an amino acid so any
structure where the basic structure is
Tyros on and on in that guy who said
only a lot of other groups are added so
that is how the Dooce the hormone
structures are so examples are the
catecholamines catecholamines examples
epinephrine or dopamine they are all
amino acid derivatives so broadly these
are the different groups of hormones now
the question is why am I talking about
these different theme performers because
each group of hormone have a specific
way of action so not every hormone
follow the same mechanism for its action
so different groups of hormones will
have different action
mechanism so we will see that so in
order to understand the first step for
any hormone to act as that there has to
be under sector who can receive the
harbor or who can recognize the hormone
right for example if you are sending the
letter to somebody so what do you need
to do you need to put the correct postal
address of that person so that there is
some address which can actually receive
your letter right so similar is the case
here so the hormones all the hormones
are flowing through the blood but there
has to be receptors there has to be
specific addresses inside the body which
can receive specific hormones so two
specific addresses are the receptors so
first let us try to understand what our
hormone receptors so hormones act on
target tissues by binding to hormone
receptors now wherever the receptor is
present the hormone will bind to that
receptor right and then it will actually
act on that particular tissue so for any
specific hormone it is suppose there is
one hormone which has to act on the
thyroid so the receptor of that hormone
which should present on the thyroid
gland so that is how it is so wherever
you go or wherever your target tissue is
there only your hormone receptor should
be present only then your hormone can
act on them target tissues for example
let us suppose this is my cotton okay
now this hormone has to act on this
organ this is some of it okay now there
has to be a receptor if there is no
receptor this hormone will not be able
to bind here so though our one will just
move on
ignoring this order but if there is a
receptor here which can receive the soil
so the warhoon will bind to that
and that is how the odd one will act on
this orbit so a Hollywood receptor is a
must for convert to act because it is
somewhat like this your plans puzzle
block so you have the dead one this is
or the red one is your hormone and the
green one is the hood receptor so anyway
the hardware receptive is there the con
one will go and bind to that receptor so
how would the septum such a structure
wise they are protein molecules or the
target cells that binds to hormones with
high affinity so they have a very strong
attraction to bind to hormones now it is
not that all the scepters can bind to
all hormones there are specific
receptors which can bind to specific
hormones for example in the blood you
might have so many different types of
hormones say one would ABCDE but if the
receptors here is for one human being
then only hormone we can bind to it if
on one a tries to buy into it it to not
be able to sew the binding between
hormones and receptors that is also
specific now receptors are very specific
in nature and this is very very
important because if you don't know this
point then you actually will not be able
to understand the concept because not
everyone can bind to every receptor so
they are very specific that this hormone
can bind only to this receptor this
sector will bind only to this wall mode
so that thing is very specific there are
two types of receptors again why this
membrane bound root sectors water
membrane bound receptors these are those
receptors which are present on the cell
membranes of target cells so let us
suppose this is your target tissue so
the target tissue is made up of many
cells so the cell membrane David all
those wells will have a cell membrane
now if the receptor is present on the
cell membrane of the target cell they
are called membrane bound to receptors
so that means the hole would be mine
sector of the membrane itself there is
another type of receptors for
intracellular receptors that means the
receptors are present inside the target
cell that means instead of the surface
the receptor will not be present here
instead the receptor will be present
somewhere here inside the target cell
that is quite intracellular receptors
now we will see how does it matter how
does it differ when a hormone binds to a
membrane bound per second and when the
hormone binds to an intracellular
receptor
how the situation differs in both the
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