2. How big is a cell?
4. FROM CELLS TO ORGANISMS All complex organisms are made up of a group of systems. All systems are composed of a group of organs. All organs are made of tissues. All tissues are made up of cells.
5. MICROSCOPE In order to view and study cells, we had to move further in technology. The development of the microscope allowed us to study and learn more about the smallest forms of life. Everything that cannot be seen with the naked eye is considered microscopic.
6. CELL SIZE Microscopic objects are meassured in: ◦ μm = 10-3 mm ◦ nm = 10-6 mm These are not visible with a naked eye. Eye resolution is 0.2 mm ◦ If two objects are separated by a smaller distance, we will see them as one. Exercise: If an object meassures 1 mm, how many micrometers does it meassure? And how many nanometers?