These are different levels of structure and function in the human body,with each level contributing to the total organism. These are :
- Cellular Level which is the basic structural and functional component of life.
- Tissue and Organ Levels. These are layers or aggregations of similar cells that perform specific functions. The primary tissue types are: Epithelial tissues, connective tissues,muscular tissues and nervous tissues. An organ is an aggregation of two or more tissues that are integrated to perform a particular function. for example Heart, spleen,pancreas,ovary,skin and bones.
- System Level A body system consists of various organs that have similar or related functions. examples are Circulatory system, nervous system, digestive system and endocrine system.
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