The study of organisms - functioning or otherwise! - is called Biology.
The special normal or proper activity of an organ or part is called its function.
an organ
an organ
The organs that are responsible to do the work or to function together are called an organ system.
Organ
Organ
The job that the organ does is the function of that organ
An organ.
For a tissue or organ to function as a unit, individual cells must communicate and coordinate their activities through signaling molecules. Additionally, they need to have specialized structures and functions that contribute to the overall function of the tissue or organ. Proper blood supply, regulation by the nervous system, and appropriate nutrient and waste exchange are also essential for optimal function.
A tissue (not the kind you sneeze into) is a similar group of cells that perform the same function. a tissue. and a group of tissues working together is called an organ. and a group of organs working together is called an organ system.
Excision of a segment or part of an organ is called a partial resection or partial excision. This procedure is done to remove a specific area of the organ while preserving the majority of its function.
That's called an "organ."