What is the term for the thin, flexible barrier that divides the internal environment of the cell from the extracellular fluid?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. plasma membrane.
The term for the thin, flexible barrier that separates the internal environment of a cell from the extracellular fluid is the "cell membrane" or "plasma membrane." This membrane is primarily composed of a lipid bilayer with embedded proteins. It controls the movement of substances in and out of the cell, providing structural support and facilitating communication with other cells. The cell membrane plays a crucial role in maintaining homeostasis and protecting the cell's internal environment.