Here we are. We are at the staircase. The girls have
gone down and in. They are on the inside
in the mitochondrial matrix. And we have lots of boys
hydrogen ions outside and they are angry.
They are looking for a way back in. They are wondering
around in the alley all upset and they find ATP synthase,
which is a revolving door. So this door will spin as
they rush through it and because they are coming back
in with so much energy, to meet up with their
electrons, the door spins really really fast.
And its that spinning of the door that allows
phosphorylation of ADP into ATP.
So hydrogen ions rush through the ATP synthase. It
causes it to spin which is realistically what happens.
There are lots of different subunits on
this protein that will spin around.
And it's the energy of them spinning around that allows
ATP to be formed from ADP and inorganic phosphates
that are floating around. So to put this all together,
let's see we have our electron transport chain,
electrons have bumped down from one molecule to the
other. Hydrogen ions have been shot out into the
back alley or the intermembrane space. Oxygen picked up
the electrons and now it really needs to be balanced
by picking up some hydrogens. So we have 2H per 1/2
O2 which is per oxygen. And we form an H20.
So, in this case we have oxidative phosphorylation driven
by electron acceptor. Oxygen pulling electrons down stairs.
And we also have chemiosmosis because hydrogen ions
were forced out into the intermembrane space
and rushed back through the ATP synthase in
order to generate our ATP. So, you can see
where the carbons have been made in the whole
process or where the carbons left the process.
You can see what happened with all the
electron transporters or all the taxis.
And you can see how much ATP is being made. So as we
look at the equation for cellular respiration,
you can now see that we have carbon dioxide being
evolved. You know where each of those carbons
come from. You had 2 coming out in pyruvate oxidation.
And the other 4, coming out during the Krebs cycle.
You can now see that we have water manufactured at the
very end of the electron transport chain and chemiosmosis.
And as a result of all of that, we have tons of ATP
made. Now, a lot of ATP is captured but naturally
we're going to lose some as heat