Question

what is the function of the cell membrane ?

Explanation:

The cell membrane has three core key functions: it acts as a physical barrier to separate the cell's internal cytoplasm and organelles from the external environment; it regulates the selective movement of substances (like ions, nutrients, and waste) in and out of the cell to maintain internal homeostasis; it also enables cell communication and recognition via surface proteins, facilitating interactions with other cells and signals.

Answer:

1. Acts as a protective physical barrier, separating the cell's internal contents from the external environment.
2. Controls the selective movement of substances (nutrients, ions, waste) into and out of the cell to maintain internal balance (homeostasis).
3. Facilitates cell-to-cell communication and recognition through surface proteins, supporting interactions with other cells and external signals.