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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aasgaduli.blogspot.com: Transport across the cell membrane

The cell membrane is a double layer of lipids and proteins that surrounds a cell and separates its contents from the surrounding environment.

Active Transport is the movement of molecules from a region of lower concentration to a region of higher concentration with the use of energy.

Cell Transport Worksheets