What is the main function of the plasma membrane?

What is the main function of the plasma membrane?

• A. Energy production
• B. Protein synthesis
• C. Regulating entry and exit of substances
• D. Cell division

Answer: (C)

The primary function of the plasma membrane is to regulate the entry and exit of substances into and out of the cell. This selectively permeable barrier ensures that essential nutrients are taken in while waste products are expelled, maintaining homeostasis within the cell. The plasma membrane consists of a phospholipid bilayer that provides structural integrity and fluidity, alongside embedded proteins that facilitate transport, signaling, and communication with the external environment. In addition to this fundamental role, the plasma membrane also contributes to cell communication and signaling pathways, which are crucial for coordinating various cellular processes. This regulatory function is vital for the survival of the cell and its overall function within the organism, as it helps to maintain the appropriate internal environment despite changing external conditions.

The primary function of the plasma membrane is to regulate the entry and exit of substances into and out of the cell. This selectively permeable barrier ensures that essential nutrients are taken in while waste products are expelled, maintaining homeostasis within the cell. The plasma membrane consists of a phospholipid bilayer that provides structural integrity and fluidity, alongside embedded proteins that facilitate transport, signaling, and communication with the external environment.

In addition to this fundamental role, the plasma membrane also contributes to cell communication and signaling pathways, which are crucial for coordinating various cellular processes. This regulatory function is vital for the survival of the cell and its overall function within the organism, as it helps to maintain the appropriate internal environment despite changing external conditions.