Biological Chemistry I
Facilitated diffusion is a process by which substances move across a cell membrane with the help of transport proteins, allowing specific molecules to enter or exit the cell without the use of energy. This method is crucial for maintaining cellular homeostasis as it allows polar or charged substances, which cannot easily pass through the lipid bilayer, to cross the membrane efficiently. The transport proteins can be specific to certain molecules, ensuring that essential nutrients and ions can enter the cell while waste products are expelled.
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