What is tissue? What tissues does the human body consist of? What is an organ? What is an organ system?

What is tissue? What tissues does the human body consist of? What is an organ? What is an organ system? What systems bodies do you know?  

Tissue is a collection of cells that perform one function. In humans, nervous, epithelial, muscle and connective tissues are isolated.
An organ is a collection of tissues that performs a specific function. An organ system is a collection of organs that perform a specific function. These are, for example, the nervous, circulatory, musculoskeletal systems.



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