How Does Cell Theory Describe The Levels Of Organization Of Living Organisms

by on December 19, 2007

Q: How does cell theory describe the levels of organization of living organisms?

A: Thank you for posting such an intriguing question! It is nice to get a break from computer questions every now-and-then.

Basically, cell theory attempts to prove that all living organisms are made of cells. It also suggests that all cells originate from other cells. Of course, that is like the chicken or the egg question. Where did the first cell come from? Science has not yet been able to provide an answer to that question. But a man named Robert Hooke first discovered cells in the 1600s. And the cell theory itself was formulated sometime in the 1800s. Modern science has discovered some possible exceptions to the theory, such as viruses. But otherwise the theory is still proving to be true.

The idea of levels of organization assumes that cell theory is correct, and then takes it to the next logical steps. The list below describes how the levels of organization as we are using the term here works.

  1. All living things are made of cells.
  2. All tissues are made of cells.
  3. All organs are made of tissues.
  4. All organ systems are made of organs (examples of organs include hearts, lungs, etc).
  5. All organisms are made of organ systems.

I find this all to be very interesting. I hope that you do as well!