Episode 137: The Digestive System
The Science of Everything Podcast
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The Different Types of Molecules in the Bloodstream
Molecules need to pass over one layer of cell membrane to enter the epithelial cells. When it does that, it then can enter the bloodstream. It's either actively transported or facilitated diffusion in some cases through special channels and gates. Short-chain fatty acids are hydrophobic so they don't actually need to pass through special gates or channels in order to pass through a cell.
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