The human body is organized into cells, tissues, organs, organ systems, and the total organism.
a. Cells are the smallest living unit of body construction.
b. A tissue is a grouping of like cells working together. Examples are muscle tissue and nervous tissue.
c. An organ is a structure composed of several different tissues performing a particular function. Examples include the lungs and the heart.
d. Organ systems are groups of organs, which together perform an overall function. Examples are the respiratory system and the digestive system.
e. The total organism is the individual human being. You are a total organism.
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