Cellular Respriation 9- Review


– And now, it is time
for the glorious capping of the whole process. Let’s walk
through the whole thing. I have a visual here,
I have an animation thing. Don’t know why that was so
difficult to say. Look.
It’s color coded. What is this guy?
That’s your mitochondria. And you see my inner
mitochondrial membrane is blue, and you see my outer mitochondrial
membrane is purple. Cytoplasm, purple. Inter membrane space,
blue. Matrix, white. Now, I think we’ll see how
exactly this is carried out, I think that we’re just
going to take a slice– yeah, yeah, yeah. You can actually label
all of these parts. What are these little
pink things that you see in the center? In the inter membrane space? Those are hydrogen ions,
so everybody’s clear on that. All right, yeah, yeah,
yeah, you’re rock stars. You already knew that, didn’t
you? You could totally do– on my gosh, and look at this,
does this look familiar? I’ve labeled my spaces for you.
Who are these guys? These are my electron– these are my proteins
in the electron transport chain. And let’s go through the process
of glycolysis. Let’s figure out
where this happens. Remember we take
a glucose molecule, we turn it into pyruvate, we get two electron carriers. Do you see my electrons here? And we get two ATPs. That’s the end game
of glycolysis. Let’s see what happens
to these things. Our ATP, where’s it headed? It’s going off to be
used in the cytoplasm, someone’s going
to do something with it. Our pyruvate, and our high
energy electron carriers are actually coming
in to the mitochondria. And pyruvate, once
in the mitochondria, we’re going to save up
our electron carriers, we’re going to just keep them
over there on the side, just to visualize our stack of electron carriers
in this whole process. But we can turn the pyruvate
into Acetyl CoA and what is that process going
to end up with? Look, we made
some carbon dioxide and two more high
energy electron carriers. That’s cool. And now, the carbon dioxide
left, now our Acetyl CoA is going to enter
the Krebs Cycle. Let’s go see what comes out. Oh my gosh, this is really cool.
What’s coming out? We’ve got two ATPs directly
out of this process. We got four carbon dioxides,
there they go, to be breathed off, and we have, what is it, eight high
energy electron carriers, for a total of twelve.
There they are, on the side. Do you remember
what happens with them? Why don’t we go to the electron
transport chain and find out. Did you see that? I took one of my high
energy electron carriers, and I’m taking it
to the electron transport chain. And you remember
that the electrons get passed to the first protein
in the chain. Now look at what just happened when my high energy
electrons were passed off, I now– I still have
an electron carrier. It’s going to go back
to some glycolysis or Krebs cycle process and pick
up more high energy electrons. So it’s just going
to continue the cycle. The protein grabs the high
energy electrons, uses the energy that comes
from the high energy electrons, to pump oh, a proton against
the concentration gradient into that inter membrane space. Meanwhile, where are
my electrons? They still
have some energy in them, and they’re on the next protein, so let’s see what happens there. Let’s get a new
electron carrier, check it out. We actually can fit
a new pair of electrons in, and now we’re going
to have more energy to do some pumping as
those electrons get passed down to the next protein. And there they go, and once
they’ve released that energy, the energy is used
to pump those protons into that inner membrane space. Do you think we can use another
high energy electron carrier? Totally.
So here comes another one, we’ve got the electrons,
let’s pass them off. We’re ready we’re primed. What’s going to happen? Where
are they going to pass them? Remember, they don’t
have anywhere to pass them. We now have a log jam. The whole thing is going
to back up. In fact, I wonder– look here I’ve got
an electron carrier that’s like, dude, I’ve got these high energy
electrons, don’t you want them? But there’s nowhere
to pass them. This stinks. So what are we going
to have to do? Looks like we’re going
to deal with that later, because first of all, we’re going to let
some of the protons out through ATP synthase. Watch this magic. Through go the protons,
boom! Now, we’ve got an ATP. And through comes some more
proton, boom! Now we’ve got some ATP. Who just appeared on the scene
to save the day? Oxygen.
Why do we need oxygen? To accept those electrons so we
can keep the process going. Can you imagine that eventually, all the protons are
going to go through. We’re going to use up
all that concentration gradient, and we’re not going to be able
to make any more ATP. So we better keep producing, we better keep maintaining
the concentration gradient with these high
energy electrons. If you grab, if you let oxygen
accept the high energy electrons as the final electron acceptor, and throw in a couple of hydrogen ions
while you’re at it, you’re going to get
a water molecule. And that water molecule,
I think my little thing is done. My whole animation is over. Because now we’ve got
the water molecule, and we can continue
the whole thing. We can go on forever
and ever and ever. And don’t worry, I won’t.
That’s it. Review that as many
times as you want, and it’s on Slide Share, so you can totally go
check it out and play with it, and this is really like,
important. Here’s your pep talk. The next lecture is
on photosynthesis. And if you don’t have a good
grip of cellular respiration, photosynthesis is going
to be like, oh, no, don’t do this to me. If you have a good grip
on cellular respiration, photosynthesis is going
to be like, I could have figured that out,
like, easy peasy. And you’ll be that happy. So go the easy peasy route, and make sure cellular
respiration rocks your world and them come back
and do photosynthesis. All right, don’t you love
cellular respiration? It’s really cool. And now I’m going to go do some, but I have to put
in some glucose first. Ice cream?
Maybe. Bye- bye.

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13 thoughts on “Cellular Respriation 9- Review

  1. I regret I can only hit "LIKE" once. THIS was a perfect wrap-up of a topic that – it took me a week-end to use, but – I FINALLY GET!!! THANK YOU, WENDY!!
    Bring on the test, sir. I am READY!!

  2. Thank you Wendy, you are helping me get through Med school. You explain things perfectly. I nice blend of casual humour and succinctness making these topics enjoyable. Keep doing what you are doing as its very much appreciated here 🙂

  3. This, like some of the other topics in my A&P book, wasn't making ANY sense until I watched and listened to your explanation. THANK YOU! THANK YOU! THANK YOU!

  4. I understand that this takes place in mitochondria which is an organelle. But where are these cells that are doin' the respiration in the body? Skeletal muscle? Liver? Small intestine?

  5. How many electrons are needed to form one water molecule? 4? Because we have 12 electron carriers and in every one of them we have 2 electrons, that makes 24 electrons.
    The end products of 1 molecule of glucose and 6 molecules of O2 are 6CO2 and 6H2O molecules.
    I don't quite get this part why 6 molecules of water. Ok, obviously we have 6O2, and I think that has something to do with this 1/2 O2, because we need one molecule of oxyden to form water not 2. Do the electrons play some role here?

  6. ONE OF THE BEST TEACHERS TO EVER EXIST! ever since i started watching your videos i started acing my exams. I will write my official in biology in 3 days and you made all the complicated topics into nothing but happiness. Thank you ♥️

  7. I just love your way of teaching. I was in class for over an hour today and left with a heavy and pounding head; now it is so light and ready for the next chapter! Thank you so much!

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