Organ (biology)

In biology, an organ is a group of tissues that work together in an organism. They specialise in particular vital functions. They create an organ system which, as a whole, is an organism.

These are examples of organs:

• Heart
• Lungs
• Brain
• Ear
• Eye
• Gall bladder
• Stomach
• Spleen
• Bones
• Pancreas
• Kidneys
• Liver
• Intestine
• Skin
• Uterus
• Bladder

Classification

Organelles > Cells > Tissues > Organs > Organ systems > Organism

Organ (biology) Media

• Leber Schaf.jpg

  The liver and gallbladder of a sheep

• Internal Organs of the Human Body from The Household Physician, 1905 (6404030777).jpg

  1905 diagram of the internal organs of human body

• Origin of major organs on the animal phylogeny.jpg

  Relationship of major animal lineages with indication of how long ago these animals shared a common ancestor. On the left, important organs are shown, which allows us to determine how long ago these may have evolved.

• Red Hibiscus in Chennai during Spring.JPG

  The flower is the angiosperm's reproductive organ. This Hibiscus flower is hermaphroditic, and it contains stamen and pistils.

• Equisetum braunii (strobilus), Portland, Oregon.jpg

  Strobilus of Equisetum telmateia