Here's why:
* Selective permeability: The cell membrane acts like a gatekeeper, allowing some substances to pass through while blocking others. This is crucial for maintaining the cell's internal environment and carrying out essential functions.
* Phospholipid bilayer: The cell membrane is primarily composed of a phospholipid bilayer, which creates a barrier between the cell's interior and the external environment.
* Proteins: Embedded within the membrane are various proteins that play a vital role in transport. These proteins can act as channels, pumps, or receptors, facilitating the movement of specific molecules across the membrane.
Let me know if you'd like to learn more about the specific mechanisms of transport across the cell membrane!
