What is an organ?
The human body and animal bodies are very organized. Specialized
groups of cells form tissues, tissues form organs, and organs form
An organ is a specialized group of tissues that performs a
particular function, and often more than one function. Examples of
organs are the brain, heart, eyes, bones, intestines, pancreas,
rectum, lymph nodes, ears, stomach, liver, and gallbladder. We have
close to seventy-eight organs in our body.
Organs may work together to form a body system. This is the case
with the major organs of the digestive system (mouth, esophagus,
stomach, small & large intestines, rectum, anus) along with its
accessory organs (salivary glands, liver, pancreas,
In music, an organ is a very large piano-based instrument. They
date back to Ctesibius of Alexandria, who lived between 285 BC and
222 BC. Today they are commonly found in catholic churches.
Organ in biology: en.wikipedia.org/wiki/Organ_(anatomy)
Organ in music: en.wikipedia.org/wiki/Organ_(music)