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Levels of organization
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Explain in detail the levels of organization using specific examples from one of the body systems discussed in class.
Chemical Level: What begins as the formation of the human body and is the simplest level is the chemical level. The atom, molecule, macromolecule and the organelle make up the chemical level. The human body is composed of chemical substances that are formed of atoms and molecules. Atoms are the fundamental building blocks of chemicals, and atoms combine in specific ways to form molecules. Some molecules are very small, such as a water molecule. But others may be very large like the macromolecules of proteins for example. Various small and large molecules are grouped together to form organelles. Organelles are a microscopic subunit of a cell. It is somewhat like a tiny organ that carries out specific functions within the cell. Cellular Level: The second level of organization is the cellular level. Because all of the processes of life occur within cells, cells are the basic structural and functional units of our bodies. The human body is made of trillions of cells; muscle, blood and nerve cells are just a few examples. Tissue Level: The third level of organization is the tissue level. Each tissue of the body consists of an aggregation of similar cells that perform similar functions. Similar types of cells are usually grouped together in the body to form a tissue. Muscle and nerve tissue are just a couple of examples but there are several different types...
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