Science Focus Topic 3 Notes: The Cell and Its Structures | Print |
The Cell      ( - Student Resources)

- All cells, plant and animal, have structures and each structure performs a specific function in order for the cell to maintain life.
- When viewed with a compound light microscope these cell structures become visible to the naked eye.

Cell  Structures

The structures inside the cell are called organelles.
See pgs 122-123
Check out the
Virtual Cell Tour


Plant Cell

Animal Cell


Cell Membrane

-  surrounds and protects the contents of the cell

Cell Wall 

-  are much thicker and more rigid than membranes, providing support for the plant or fungi


-  distributes materials to different parts of the cell


-  controls the cell?s activities


-  is a membrane-bound sac acting as a storage space for surplus food, wastes and other substances the cell is unable to use immediately


-  are the structures in which photosynthesis takes place (found in green plants)

Cell Size and Function

- to carry out their work, cells need a constant supply of materials, such as oxygen, water and food particles and they also need to get rid of waste products, all these materials must pass through the cell membrane, most cells fall into a very narrow range of size between 10 - 50
micrometers (um)

Animal Cell

Plant Cell

Topic 3 Review p. 126

WRAP-UP  p. 127
>>>>  A good review of Topics 1 ? 3  in this Unit  <<<<