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Engineering HSC and IIT-JEE Mains and
Advanced videos.Hello Students, Today we
are starting chapter respiration in that
today we'll be starting about krebs
cycle or TCA cycle when i say TCA cycle
it means tricarboxylic acid cycle so
what is the tricarboxylic acid cycle
and how is it related with the
process of respiration let's study and
find out.
kerbs cycle now hence kreb was a
scientist who discovered this Krebs
cycle that's the reason krebs name came
into picture and why it is called as TCA
cycle or tricarboxylic acid cycle
because there's a product or you can say
the first stable product is of 3-carbon
TCA cycle is a process that every
organism or every new organs of thus to
generate energy in the form of ATP
during aerobic respiration this process
actually takes place in the mitochondria
and we all know that mitochondria is the
powerhouse of the cell
when I say powerhouse of the circuit is
the that place where ATP is actually
made ATP is generated during the process
of TCA and this process takes is in the
powers of the cell in mitochondria there
is an 80-page machine that's present
inside the mitochondria space in the
matrix of the mitochondria which is
involved in this process do the TCA
cycle oxygen is used as the raw source
and carbon dioxide and water is given
out
correct cycle or TCA cycle when I say
TCA cycle
it means tricarboxylic acid cycle and
hence scrap was a native of the
scientists who actually developed this
cycle now krebs cycle is nothing but it
is a sequence of reactions by which most
of the living organisms including plants
generate energy during aerobic
respiration
now when I say aerobic respiration it is
linked with glycolysis which we have
studied in previous part the conversion
of glucose to pyruvate that is also a
part of aerobic respiration along with
Krebs cycle or TCA cycle this process
takes place inside mitochondria
now when I say mitochondria this is the
powerhouse of the cell or the place
where ATP is actually synthesized the
energy currency making device and it is
present in a cell and the process to
form ATP using ATK's machine in
mitochondria is dunya now what is used
yes during this process is oxygen and
other products are used as a raw
material whereas carbon dioxide and
water is given out as a waste or a
by-product of this process students
this is Krebs cycle or you say it's
simply TCA cycle now this process
actually starts with acid i ka now
acetyl CoA is formed as an intermediate
product between glycolysis and TCA cycle
after catharsis there are certain set of
reactions that actually form acid I boil
once the acid Alcoa is formed it is sent
to the Krebs cycle or TCA cycle and it
gets converted into citric now citrate
is a six carbon molecule one citrate is
form the next molecule that is formed is
isocitrate which is again a six carbon
molecule the conversion of isocitrate
leads to the formation of a five carbon
molecule which is alpha ketoglutarate
and doing this step a high energy giving
molecule that is nad p nicotinamide
adenine dinucleotide phosphate is broken
down and energy is taken from that
now once the five carbon molecule which
is alpha ketoglutarate undergoes in the
presence of enzyme alpha ketoglutarate
sucks in synthase to form
succinylcholine now the five carbon
molecule gets converted into a four
carbon molecule once this four carbon
molecule is from for the succinylcholine
gets converted to similar Foca of a
molecule which is sucks in it sucks in
it is broken down into smaller molecules
of fumarate in the presence of enzyme
fumarate kinases or reductases once
fumarate is from this four-panel
molecule forms the further product we
just married now mallet you all have
heard about mallet remember the other
steps of photosynthesis mallet was some
well present photorespiration yes mallet
is further broken down into oxaloacetate
so this is how the cycle moves into
picture and this is our correct cycle
moves on it starts with the process of
oxaloacetate saturate isocitrate and
goes on in series
students krebs cycle or you can say TCA
cycle is solely and wholly concentrates
on ATP formation that is it takes care
that the another part of the respiration
that is after glycolysis the respiration
part that takes place is looked upon
once glycolysis respiration is done and
through then comes the formation of
acetyl co a and once I said I'll Kuwait
is from it is sent to the TCA cycle to
carry out this process so the expiration
if I say in interim implants would
compose of two of these cycles one is
glycolysis and another partner is the
TCA cycle or the Krebs cycle so is it
true if I say that first glycolysis will
take place and then Krebs cycle no TCA
cycle who take this yes it's true
I hope you are clear with this concept
of TCA cycle or Krebs cycle
thank you
