Transport across cell membrane | Tamil
Transport across cell membranes is the movement of molecules and ions across the plasma membrane of a cell. It is essential for the cell to obtain nutrients, remove waste products, and communicate with other cells. There are two main types of transport across cell membranes: passive transport and active transport.
Passive transport does not require energy from the cell. It is driven by the concentration gradient of the molecules or ions being transported. Diffusion, osmosis, and facilitated diffusion are all examples of passive transport.
Active transport requires energy from the cell to move molecules or ions against their concentration gradient. This energy is usually provided by ATP. The sodium-potassium pump is an example of active transport.
Transport across cell membranes is essential for life. It allows cells to obtain the nutrients they need, remove waste products, and communicate with other cells.