Cell membrane transport

If a cell were a house, the plasma membrane would be walls with windows and doors. Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.

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The cell membrane separates the inside of a cell from the environment surrounding it. It helps to protect the cell, controlling what can

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Diffusion is the tendency of molecules to spread into an available space. The diffusion of substances across a membrane is called passive transport.

The fluid mosaic model of plasma membrane is the most accepted hypothesis, which describes the membranous components and their functions. According to this model, the plasma membrane is similar to a fluid, in which various molecules are arranged in a mosaic-like pattern.

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Cell Transport Worksheets