ion transport

How Do Ions Move Across Cell Membranes?

Ions can move across cell membranes through several mechanisms:
Passive Transport: Ions move along their concentration gradient without the use of energy. Examples include diffusion and facilitated diffusion.
Active Transport: Ions move against their concentration gradient using energy, typically from ATP. A classic example is the sodium-potassium pump.
Secondary Active Transport: This involves the coupling of ion movement to the transport of another substance. It includes symport and antiport mechanisms.

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