It is a structure that contains at least two different types of tissue functioning together for a common purpose.
In biology, an organ or viscus is a collection of tissues joined in a structural unit to serve a common function. In anatomy, a viscus /ˈvɪskəs/ is an internal organ, and viscera is the plural form. Organs are composed of main tissue, parenchyma, and sporadic tissues, stroma. The main tissue is that which is unique for the specific organ, such as the myocardium, the main tissue of the heart, while sporadic tissues include the nerves, blood vessels, and connective tissues. Functionally related organs often cooperate to form whole organ systems. The English word organ derives from the Latin organum, meaning instrument, itself from the Greek word organon, implement, musical instrument, or organ of the body. The Greek word is related to ergon, work. The main tissue is the one that is unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are the nerves, blood, connective etc.. Functionally related organs often cooperate to form whole organ systems. There are 10 major organ systems in the human body. List of Organs in human body: 1  Heart. 2  Brain. Organs in the human body: Functions, location, definition of organs. An organ is a structure that contains at least two different types of tissue functioning together for a common purpose. There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ. For example, main tissue in the heart is the myocardium, while sporadic are the nerves, blood, connective etc.. Functionally related organs often cooperate to form whole organ systems. There are 10 major organ systems in the human body. List of Organs in human body: 1  Heart. 2  Brain. Organs Of The Body. There are almost 78 organs in a human body which vary according to their sizes, functions or actions. An organ is a collection of millions of cells which group together to perform single functions in a our body. The cells in these body organs are highly specialized and form for all the necessary actions for some specific time. Out of these 78 organs of a male or female body, skin is the largest organ with respect to its size and weight. The major organ in the body of human beings is the brain which is primarily responsible for performing all the functions and actions of the body. Other major organs of the body are given in the following list with names, diseases, location and functions Spleen is the largest lymphatic organ in the human body. Lymphatic or lymphoid organs are the major parts of the immune system of our body. Function of the immune system is to protect the host (i.e. human body) from the invasion of foreign organisms. The cells in these body organs are highly specialized and form for all the necessary actions for some specific time. Out of these 78 organs of a male or female body, skin is the largest organ with respect to its size and weight. The major organ in the body of human beings is the brain which is primarily responsible for performing all the functions and actions of the body. Other major organs of the body are given in the following list with names, diseases, location and function Nervous system. As commonly defined, the human body is the physical manifestation of a human being, a collection of chemical elements, mobile electrons, and electromagnetic fields present in extracellular materials and cellular components organized hierarchically into cells, tissues, organs ,and organ systems. The largest organ in the human body is the skin. Covering the entire body, even the eyes, which have a transparent layer of skin called the conjunctiva, the skin offers protection from water, air, sunlight, injury, dirt, chemicals, and microorganisms. Inside the Torso. The body's functions are conducted by organs. Each organ is a recognizable structure (for example, the heart, lungs, liver, eyes, and stomach) that performs specific functions. An organ is made of several types of tissue and therefore several types of cells (see Cells).  Largest organ. Your skin is your largest organ. It covers your entire body and has a surface area of around 2 square metres. Its thickness varies from 0.5mm on your eyelids to 4mm or more on the palms of your hands and the soles of your feet. In total, it accounts for around 16 percent of your body weight.  Vital organs. Humans have five vital organs that are essential for survival. These are the brain, heart, kidneys, liver, and lungs. The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones.
https://en.wikipedia.org/wiki/Organ_(anatomy) http://www.the-human-body.net/organs.html http://www.the-human-body.net/organs.html http://www.organsofthebody.com/ http://www.organsofthebody.com/ http://www.newworldencyclopedia.org/entry/Human_body http://www.merckmanuals.com/home/fundamentals/the-human-body/tissues-and-organs http://www.bbc.co.uk/science/humanbody/body/factfiles/skin/skin.shtml http://www.livescience.com/37009-human-body.html
what is a human organ