What are the six levels of organization in the human body? List them from simplest to most complex.
The six levels of organization in the human body, listed from simplest to most complex, are:
1. Chemical level: The most basic level where atoms and molecules interact to form compounds and perform chemical reactions.
2. Cellular level: Cells are the basic structural and functional units of living organisms. They combine to form tissues.
3. Tissue level: Tissues are groups of similar cells that work together to perform a specific function. Examples include epithelial, connective, muscular, and nervous tissues.
4. Organ level: Organs are composed of different types of tissues that work together to carry out specific functions. Examples include the heart, liver, lungs, and brain.
5. System level: Systems are groups of organs that work together to perform complex functions and support the overall functioning of the body. Examples include the circulatory, respiratory, digestive, and nervous systems.
6. Organism level: The highest level of organization, where all the systems and organs work together to form a fully functioning organism - in this case, a human being.