Plasma Membrane

What is plasma membrane or Cell Membrane?

Plasma membrane is the outermost living, thin and delicate covering of the cell. It separates the contents of the cell from its external environment.

Plasma Membrane

What is plasma membrane made up of?

Plasma membrane is made up of lipids (phospholipid) and proteins. It provides flexibility to plasma membrane.

The composition of plasma membrane helps it to engulf food and other materials from the external environment. It also makes plasma membrane selectively permeable, semipermeable, partially permeable and differentially permeable membrane.

Also Check – Golgi Body | Golgi Apparatus | Define ,Functions, Life of cell without Golgi Body

Plasma membrane is called selectively permeable membrane?

Plasma membrane is called selectively permeable membrane because it allows the entry and exit of some selective material in and out of the cell. It also prevents movement of some other materials.

What would happen if the plasma membrane ruptures or breakdown?

In case plasma membrane ruptures or breakdown 

  • All the useful substances will move out of the cell because the membrane is selectively permeable.
  • The transportation of materials will be disturbed.
  • The cell will lose its normal shape.
  • This may lead ultimately to the death of the cell.

Also Check- Cell Structure and functions Class 8 NCERT Notes

What are the functions of plasma membrane?

Functions of plasma membrane

  • It allows entry and exit of some selective material in and out of the cell.
  • It helps to maintain the shape of the cell.
  • It acts as a mechanical barrier and protects the internal contents of the cell from leaking out.
  • It provides protection against microbes and foreign substances.
  • It gets modified to perform different functions, for example microvilli in the intestine of human beings for absorption.
  • Its semi permeability enables the cell to maintain Cellular homeostasis.

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