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Levels of Structural Organization
The human body is made up of many levels of structural organization. The first level is the chemical level. It is the simplest level in which atoms, tiny building blocks of matter, combine to form molecules. Molecules work together to form organelles, basic components of the microscopic cells. The cellular level consists of cells that work together and create the tissue level. Tissues are groups of similar cells that have a common function. Tissues are used to protect and connect body organs. Organs are made up of at least two types of tissues, but usually consist of four each. Organs perform specific function throughout the body. The organ level allows for functions to become possible. The organs all perform separate functions that only they can perform. One example is the stomach. It is made up of epithelium, muscle, connective tissues, and nerve fibers. This illustrates separate tissues working together to create an organ that performs a specific function. When organs work together this is called an organ system. One example of this is the heart which works with blood vessels of the cardiovascular system to continuously circulate blood throughout the body. Throughout the body there are many organ systems including, the integumentary, skeletal, muscular, nervous, endocrine, respiratory, digestive, lymphatic, urinary, and reproductive systems. The final level is the organismal level. This level is the highest level of organization where everything works together to promote life.
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