1. The chemical level and letters – atoms and molecules can be compared to letters of the alphabet.
2. The cellular level and words – cells, the smallest living units in the human body can be compared with words, the smallest elements of language.
3. The tissue level and sentences – cells join together to form tissues similar to the way words are put together to form sentences.
4. The organ level and paragraphs – tissues join together to form organs similar to the way sentences are put together to form paragraphs.
5. The system level and chapters – organs join together to form systems similar to the way paragraphs are put together to form chapters.
6. The organism level and books – systems join together to form an organism similar to the way chapters are put together to form a book.
Tortora, G.J. and Derrickson B. (2010). Introduction to the Human Body: The Essentials of Anatomy and Physiology (8th Ed.).
: John Wiley & Sons, Inc. Hoboken, NJ