What Is A Cell Membrane?

A cell membrane is the structure that completely encloses every cell, animal or plant. It is a sandwich of two layers of phospholipids that lie tail to tail, forming a good barrier to most substances, and keeping the cytoplasm of the cell from leaking out. However, the cell needs things to get in and out of its cytoplasm and this is where the proteins that are studded into the membrane come into play.

There are many different proteins with different functions but quite a few act as channels ~ specific gateways through which only some substances can pass. This type of membrane protein generally spans the whole depth of the lipid bilayer and substances literally cross them like a bridge. Other proteins are just on the outside of the cell ~ these are more likely to be involved in cell recognition. Some others are just on the inside ~ there are likely to be involved in control of internal cell processes.

The cell membrane is very easy to remember

  CELL MEMBRANE
  -membrane movement
  - moving food, water, and waste

So the main job of the cell membrane is to move food, water, and waste.

A cell membrane is a part of your phone in which , if the correct button is pressed, you self-destruct and can possibly become nuclear active

I got it at www.wisegeek.com,In simple terms, the cell membrane can be thought of as the skin or protective barrier of cell.  It keeps all the internal components —  or cytoplasm — of a cell inside of it, and the external items outside of it.  Its main purpose is to maintain the integrity of the cell and determine what can enter and exit the cell.

It is a partially permeable membrane which controls substances entering or leaving the cell. It also surrounds large spaces or vacuoles within the cell.

A selective permeable membrane maintaining the integrity of the cell constituents and provide a medium for different organelles to play their role as well as act as a barrier between outer and inner membrane is called a cell membrane.