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