Go to old Version of website

To Earth Science

To Physical Science

To Science Skills

To Life Science Main

Cells

Defining Life

 

The Microscope

 

The Cell

 

The Cell's

Alive

 

Cells in Organisms

Ecology

Matter and Energy Cycles

 

Organsim Interactions

 

Plant and Animal Adaptations

Genetics

DNA and Chromosomes

 

Traits

 

Sexual and Asexual Reproduction

 

Punnet Squares

Evolution

Evidence

 

Natural Selection

 

Artificial Selection

Human Body

Cells to Body Systems

 

Nervous Systems

 

Immune System

 

Life Science Links

 
Cell Membrane

 

All cells have cell membranes. The cell membrane is the outside layer that separates the cell from the outside. In cells that have a cell wall the cell membrane is the second layer.

 

The cell membrane controls what materials come into and out of a cell. Everything the cell needs comes into the cell through the cell membrane. The cell membrane lets in food, oxygen, water, and other nutrients into the cell. The cell's waste leaves the cell through the cell membrane. The cell membrane also prevents harmful materials from entering the cell.