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refined the title and body to be more specific
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edit approved May 31, 2016 at 14:52
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edit approved May 31, 2016 at 14:52
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Really understanding What is the molecular mechanism behind oncotic pressure and osmosis?

I can't wrap my head around the idea of oncotic pressure and osmolarity, logically.

I imagine a blood vessel. It is FILLEDfilled with proteins...Like, like a ton of proteins and solutes. So this means, according to oncotic pressure and osmolarity, that water will diffuse INTOinto this blood vessel.

I can't understand that. If I have a glass full of water, and I drop a bunch of rocks into the water (my proteins) the water will flow OUTout of the glass...It It will exert a force, a very basic force of buoyancy, that will lead water OUTout of the glass.

WhyHow exactly is it the other way around with osmolarity and oncotic pressure generated?

Really understanding oncotic pressure and osmosis

I can't wrap my head around the idea of oncotic pressure and osmolarity, logically.

I imagine a blood vessel. It is FILLED with proteins...Like a ton of proteins and solutes. So this means, according to oncotic pressure and osmolarity, that water will diffuse INTO this blood vessel.

I can't understand that. If I have a glass full of water, and I drop a bunch of rocks into the water (my proteins) the water will flow OUT of the glass...It will exert a force, a very basic force of buoyancy, that will lead water OUT of the glass.

Why is it the other way around with osmolarity and oncotic pressure?

What is the molecular mechanism behind oncotic pressure?

I can't wrap my head around the idea of oncotic pressure and osmolarity, logically.

I imagine a blood vessel. It is filled with proteins, like a ton of proteins and solutes. So this means, according to oncotic pressure and osmolarity, that water will diffuse into this blood vessel.

I can't understand that. If I have a glass full of water, and I drop a bunch of rocks into the water (my proteins) the water will flow out of the glass. It will exert a force, a very basic force of buoyancy, that will lead water out of the glass.

How exactly is oncotic pressure generated?

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Paze
Paze
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Really understanding oncotic pressure and osmosis

I can't wrap my head around the idea of oncotic pressure and osmolarity, logically.

I imagine a blood vessel. It is FILLED with proteins...Like a ton of proteins and solutes. So this means, according to oncotic pressure and osmolarity, that water will diffuse INTO this blood vessel.

I can't understand that. If I have a glass full of water, and I drop a bunch of rocks into the water (my proteins) the water will flow OUT of the glass...It will exert a force, a very basic force of buoyancy, that will lead water OUT of the glass.

Why is it the other way around with osmolarity and oncotic pressure?