An organ is defined as the structure that formed by two or more primary types of tissues, which execute the functions of the organ. Some organs are composed of all the four types of primary tissues.

The organs are of two types called tubular or hollow organs and compact or parenchymal organs.

The organs, which have important functions, are heart, brain, liver, lungs, kidneys, endocrine glands, etc

English Vocabulary: Internal Organs of the Human Body - ESLBuzz Learning  English | Human body vocabulary, Human body organs, Body anatomy organs