Simple diffusion facilitates the passage of small, nonpolar, uncharged molecules like oxygen, and lipid-soluble substances such as steroids across membranes.
Small, non-polar, uncharged molecules like oxygen, and lipid-soluble molecules such as steroids, can move across a membrane by simple diffusion.
| Front | State which types of molecule can move across a membrane by simple diffusion. |
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| Back | Particles transported by simple diffusion:
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