Membrane Transport

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facilitated diffusion

A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of

endocytosis

The plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. This describes the process of

active transport

The sodium-potassium pump uses energy from ATP to move sodium ions out of the cell, and potassium ions into the cell. This is an example of

through facilitated diffusion or diffusion

Water crosses the plasma membrane

active transport

molecules move across the plasma membrane against their concentration gradient.


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