Answer :
Using the theories of the cells, we got that the movement of substances across the cell membrane that does require the use of energy by the cell is active transport.
The contents of the cell are completely surrounded by its cell membrane or plasma membrane. Thus, any communication between cell and the extracellular medium is mediated by cell membranes. These cell membranes serves two important functions:
- It must retain the dissolved materials of cell so that they do not simply leaks out into the environment.
- It should also allow the necessary exchange of the materials into and out of the cell.
There are two major methods for moving molecules across the membrane, and it is related to whether or not the cell energy is used. Passive mechanisms, such as the diffusion, require no energy to function, whereas active transport does. In passive transport, an ion or the molecule crosses a membrane and moves down its concentration or electrochemical gradient. The different types of the transport mechanisms across cell membranes are as follows:
- Simple diffusion
- Facilitated diffusion
- Osmosis
Hence, the movement of substances across the cell membrane that does require the use of energy by the cell is active transport.
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