This is your lumen.

So this was the lumen.

So this is the lumen.

Hydrogen protons get pumped into the lumen.

Because that's right immediately outside of the lumen.

It would look something like this, where you have the middle called the lumen. and right outside of the lumen you have cells.

So this inside right here, this is our lumen.

That's called the thylakoid space or the thylakoid lumen.

So let's say that that right there is the lumen.

The apical membrane that faces the lumen, it's porous to calcium.

This is a cell that makes up the wall of the lumen.

So they'll want to go back into the stroma from the lumen.

Region II which sits closest to the pore lumen, forms the pore lining.

literally, pumps that allow hydrogen protons to go from the stroma to the lumen.

They get pumped into the lumen and so you might remember this from the electron transport chain.

Let's say that this is the lumen right here, so we have cells on either side of that.

Traditionally, clinical carotid ultrasounds have only estimated the degree of blood lumen restriction, stenosis, a result of very advanced disease.

This is the layer which actually touches the food you are swallowing and you digest, which is actually the lumen.

I really want to give you the idea of how things are transported out of the lumen, how they're selectively reabsorbed.

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The more we pump out, the lower this is, and eventually it's going to be lower than the sodium concentration in the lumen.

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