What is the Difference Between Cell Membrane and Cytoplasm?

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The cell membrane and cytoplasm are two major components of a cell, serving different functions and having distinct structures.

Cell Membrane:

  • The cell membrane is a biological membrane that separates the interior of the cell from the outside environment.
  • It is composed of a bilayer of phospholipids, with their hydrophobic, fatty acid tails in contact with each other.
  • The cell membrane is responsible for controlling what can enter and exit the cell.

Cytoplasm:

  • The cytoplasm is the gel-like substance inside the cell, composed of water, salts, and various organic molecules.
  • It holds cell organelles and acts as a reaction medium for metabolic reactions.
  • In eukaryotic cells, the cytoplasm is everything between the plasma membrane and the nuclear envelope.

In summary, the cell membrane serves as a protective barrier, controlling the movement of substances in and out of the cell, while the cytoplasm is a gel-like medium that contains organelles and facilitates metabolic reactions.

Comparative Table: Cell Membrane vs Cytoplasm

Here is a table highlighting the differences between the cell membrane and cytoplasm:

Feature Cell Membrane Cytoplasm
Definition A double-layered phospholipid membrane that separates the cell from its environment A jelly-like semifluid that encloses the cell's organelles and is located inside the cell's plasma membrane
Function Protects the cell and gives it a definite shape Holds the cell organelles and acts as a reaction medium
Separation from external environment Separates cells from one another and from the external environment Doesn't separate cells from one another and from the external environment
Stored and released energy Energy is not stored or released in the cell membrane Energy is stored and released in the cytoplasm
Protoplasm Not part of the protoplasm Part of the protoplasm (along with the nucleus)
Movement of substances Contains small pores that control the movement of different substances across the cell Not responsible for the movement of various molecules across the cell membrane
Cell adhesion and ion conductivity Primary site involved in cell adhesion and ion conductivity Not involved in cell adhesion and ion conductivity

Both the cell membrane and cytoplasm are essential components of a cell, each serving different functions and having unique properties.