Anatomy & Physiology › Section C · The cellular level › Topic C.1
The cell membrane
Every one of your trillions of cells keeps its inside chemically different from the fluid around it. The cell membrane makes that possible, and the way it lets substances in and out underlies nerve signals, absorption of food and the fluids clinicians choose for a drip.
In this topic
- Two fluids, one boundary
- A fluid, selective bilayer
- Proteins and the glycocalyx
- Diffusion, with and without help
- Osmosis and tonicity
- Worked example: comparing fluids with plasma
- Filtration
- The sodium-potassium pump
- Moving cargo in vesicles
- Worked example: cystic fibrosis and a faulty channel
- Common mistakes to avoid
- Key takeaways
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