Why plasma membrane is called selectively permeable membrane class 9?
Question: Why plasma membrane is called selectively permeable membrane class 9?
The plasma membrane, also known as the cell membrane, is called a selectively permeable membrane because it only allows certain substances to pass through it. The plasma membrane acts as a barrier that controls the movement of substances in and out of the cell.
Some substances, like oxygen, carbon dioxide, and water, can freely diffuse across the plasma membrane without any assistance. Other substances, like ions and large molecules, need help to pass through the membrane. This help can be provided by membrane proteins, which act as channels or pumps to transport these substances across the membrane.
The selective permeability of the plasma membrane is crucial for maintaining the balance of substances within the cell and ensuring that the cell functions properly. For example, it allows the cell to take in nutrients and expel waste, and to maintain a balance of ions and other substances that are important for cellular processes.
In summary, the plasma membrane is called a selectively permeable membrane because it only allows certain substances to pass through it, while excluding others. This selective permeability helps to maintain the balance of substances within the cell and support cellular function.
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