Kaplan Nursing Entrance Practice Exam

What does the cell membrane also refer to?

1. Cell wall

2. Plasma membrane

3. Nuclear membrane

4. Endoplasmic reticulum

The correct answer is: Plasma membrane

The cell membrane is also known as the plasma membrane. This membrane forms the outer boundary of the cell and is crucial for maintaining the cell's structural integrity while also regulating the movement of substances in and out of the cell. The plasma membrane is primarily composed of a phospholipid bilayer with embedded proteins, which contribute to its various functions such as signaling, transport, and cell communication. The terminology is often used interchangeably in biological contexts, where "cell membrane" typically refers to the boundary of all cells, while "plasma membrane" is more commonly used in discussions about eukaryotic cells. Understanding this terminology is fundamental in cell biology, as it helps differentiate between the various membranes associated with cell organelles and structures.